You can easily create FreeBSD based VM using the following procedure.

Install gcloud SDK on Linux

First, make sure that Python 2.7 is installed on your Linux based desktop system. Next use the curl command or wget command to grab file:
$ wget https://dl.google.com/dl/cloudsdk/channels/rapid/downloads/google-cloud-sdk-183.0.0-linux-x86_64.tar.gz
Use tar command to untar the tarball and install it:
$ tar zxvf google-cloud-sdk-183.0.0-linux-x86_64.tar.gz
$./google-cloud-sdk/install.sh
Initialize the gcloud SDK:
$ gcloud init
In your browser, log in to your Google user account when prompted and click Allow to grant permission to access Google Cloud Platform resources. Verify that it is working:
$ gcloud auth list

Install gcloud SDK on Mac OS X

Type the following commands:
$ wget https://dl.google.com/dl/cloudsdk/channels/rapid/downloads/google-cloud-sdk-183.0.0-darwin-x86_64.tar.gz
Extract tar.gz file using the tar command and install sdk:
$ tar -zxvf google-cloud-sdk-183.0.0-darwin-x86_64.tar.gz
$ ./google-cloud-sdk/install.sh
$ gcloud init
$ gcloud auth list

Get list of gcloud compute images

Type the following command:
$ gcloud compute images list --project freebsd-org-cloud-dev --no-standard-images
OR
$ gcloud compute images list \
--project freebsd-org-cloud-dev \
--no-standard-images | grep -i freebsd-11
Sample outputs:

freebsd-11-0-beta4-amd64                  freebsd-org-cloud-dev                      READY
freebsd-11-0-current-amd64-2015-07-23     freebsd-org-cloud-dev                      READY
freebsd-11-0-current-amd64-2015-08-04     freebsd-org-cloud-dev                      READY
freebsd-11-0-current-amd64-2015-08-19     freebsd-org-cloud-dev                      READY
freebsd-11-0-current-amd64-2015-08-27     freebsd-org-cloud-dev                      READY
freebsd-11-0-current-amd64-2015-09-04     freebsd-org-cloud-dev                      READY
freebsd-11-0-current-amd64-2015-09-18     freebsd-org-cloud-dev                      READY
freebsd-11-0-current-amd64-2015-10-02     freebsd-org-cloud-dev                      READY
....
...
freebsd-11-1-beta2-amd64                  freebsd-org-cloud-dev                      READY
freebsd-11-1-beta3-amd64                  freebsd-org-cloud-dev                      READY
freebsd-11-1-prerelease-amd64-2017-05-19  freebsd-org-cloud-dev                      READY
freebsd-11-1-prerelease-amd64-2017-05-26  freebsd-org-cloud-dev                      READY
freebsd-11-1-prerelease-amd64-2017-06-02  freebsd-org-cloud-dev                      READY
freebsd-11-1-rc1-amd64                    freebsd-org-cloud-dev                      READY
freebsd-11-1-rc2-amd64                    freebsd-org-cloud-dev                      READY
freebsd-11-1-rc3-amd64                    freebsd-org-cloud-dev                      READY
freebsd-11-1-release-amd64                freebsd-org-cloud-dev                      READY
freebsd-11-1-stable-amd64-2017-07-28      freebsd-org-cloud-dev                      READY
freebsd-11-1-stable-amd64-2017-08-08      freebsd-org-cloud-dev                      READY
freebsd-11-1-stable-amd64-2017-08-15      freebsd-org-cloud-dev                      READY
freebsd-11-1-stable-amd64-2017-08-23      freebsd-org-cloud-dev                      READY
freebsd-11-1-stable-amd64-2017-08-29      freebsd-org-cloud-dev                      READY

How to deploying FreeBSD 11 on Google cloud

The syntax is:
$ gcloud compute instances create {INSTANCE} --image freebsd-11-1-release-amd64 \
--image-project=freebsd-org-cloud-dev
You need minimum 22GB disk space. So here is my command to create a VM in us-central1-c zone, n1-standard-1 machine type, and boot disk set to 60GB SSD storage:
$ gcloud compute instances create "nixcraft-freebsd11" \
--zone "us-central1-c" \
--machine-type "n1-standard-1" \
--network "default" --maintenance-policy "MIGRATE" \
--image "freebsd-11-1-release-amd64" --image-project=freebsd-org-cloud-dev \
--boot-disk-size "60" \
--boot-disk-type "pd-ssd"
Sample outputs:

How to ssh into FreeBSD 11 Google cloud compute server?

Simply type the following command:
$ gcloud compute ssh {INSTANCE}
$ gcloud compute ssh {INSTANCE} --zone "us-central1-c"
$ gcloud compute ssh nixcraft-freebsd11 \
--zone "us-central1-c" \
--project "mybsdvms-nixcraft-156800"
$ ssh -i ~/.ssh/my-gcs user@public-IP
Sample session:

How do I list my Google compute VMs?

Type the following command from your Unix/Linux desktop:
$ gcloud compute instances list

How do I login as root user?

Simply type the command:
$ sudo -s
#

How do I install a bash shell?

Simply type the following pkg command to install a bash shell on FreeBSD 11, run:
# pkg install bash
Sample outputs:

How do I upgrade my FreeBSD 11.x hosted on Google compute?

Run the following command to update base system:
# freebsd-update fetch
# freebsd-update install
## [optional but needed for the FreeBSD kernel and other stuff] ##
# reboot
Run the following command to update installed packages to the latest version:
# pkg update
# pkg upgrade
Sample outputs:

Updating FreeBSD repository catalogue...
FreeBSD repository is up to date.
All repositories are up to date.
Checking for upgrades (5 candidates): 100%
Processing candidates (5 candidates): 100%
The following 4 package(s) will be affected (of 0 checked):

Installed packages to be UPGRADED:
	sudo: 1.8.20p2_2 -> 1.8.20p2_3
	python27: 2.7.13_6 -> 2.7.13_7
	curl: 7.54.1 -> 7.55.1
	ca_root_nss: 3.31 -> 3.32

Number of packages to be upgraded: 4

13 MiB to be downloaded.

Proceed with this action? [y/N]: y
[1/4] Fetching sudo-1.8.20p2_3.txz: 100%  891 KiB 912.5kB/s    00:01    
[2/4] Fetching python27-2.7.13_7.txz: 100%   10 MiB  10.9MB/s    00:01