OK I haven't found renderings but I did find this historic photo of what the existing building used to look like, when it was a car barn for the Portland & Yarmouth Electric Railway (the left bay appears to have been demolished but I wonder if the sign on the pediment is still there under the metal siding?)
The Portland & Yarmouth Electric used to run streetcar service every 15 minutes along what is now Route 88 from Portland through Falmouth Foreside to downtown Yarmouth:
https://en.wikipedia.org/wiki/Portland_and_Yarmouth_Electric_Railway