That really is a beast of a motor isn't it! We've got to build Taz's frame in the garden shed -a bit dodgy throwing welding & grinding sparks about as it's a wooden shed! The floor's all wibbly wobbly so first job will be to buy a sheet of thick chipboard & screw it to the shed floor with shims under it to lecel things up.
Right VB, my last attempt at persuading you about my vintage industrial theme for your trike:
I was chatting to Yoda today & the phrase "Steam Punk" came up, (conversations with Yodie get quite surreal sometimes!). Check out some of the RamRod cartoon strips in Back Street Heroes. Sort of pseudo Victorian industrial age engineering with a modern twist. Like a Victorian inventor's version of a modern trike -keep that green engine paint, solid wheels with rivets around the outside edge, like Centrelines, but painted. Lots of polished brass pipework & intricately made brass & copper detailing. Little levers & dials all over the place, (check the autojumbles or use old engineering parts like levers & knobs from old lathes to operate the choke for example. Bung a steam pressure guage on the side of the engine. Make a one off, angular tank with lines of fake rivets along the edges. Cover modern parts like master cylinders with brass covers or rivetted steel boxes. Heavy engineering to match the size of the motor. Maybe a big brass headlight. Make it look like it's just ridden out of some turn of the century workshop.
Of course, you'll have to wear a tall stovepipe hat when you ride it & grow a waxed moustache, but I think it's worth it.

No? Oh well.