For the fuel tank - have you considered a rear mounted/under rack style tank? ThatsDax has got 'em: ENGINE_KIT_PARTS_PAGE_5
I thought about one for my latest project, but ended up makin' a tank.
For the front motor mount, I used a piece of angle steel and a chunk of 1"ID pipe welded together to make this (click pics to view);
Then there's bairdco's version for his Colson;
There's 2Door's welded tab & bushing;
joek's $2 front mount;
and no doubt many more I'm overlookin' lol