Dean
I made a little folder of GrassHopper photos,
http://new.photos.yahoo.com/len19070/al ... 2383190466
If your going to build, in Pennsylvania a trailer frame with a title is worth everything. You have 2 great sources right there in Quakertown.
Tractor Supply on Rt. 309 and Red Trailer on Rt. 663. I know that with the Tractor Supply trailer you walk away with a PA title. Since the Red Trailer is a kit, I don't know (but I doubt it).
A Certificate of Origin is not a title. Some folks will tell you that they had no problem getting a PA title from a Certificate of Origin. They are the exception to the rule. For the most part applying for a PA. title from a C of O is a real pain in the A**.
Happy Trails
Len