Quote from patricks on 09.10.19 at 19:30:53:So correct me if I misunderstand, I use the axles, clutch of the BT1100, gears and outer clutch plate of the TR1
Bingo. You have to shorten the clutch-basket studs to be flush with the clutch-basket in the process of the conversion. I milled them down, but I hacksawing them to the approximate length and then filing them down to length should be absolutely doable. Just use a straight edge (or at least some straight bar) to make sure you get them all the same length.
What did you make your spacers/alignment plates out of? Looks like a sliced up cylinder. Never said your solution wouldn't work, I just pointed out, it's the slightly "hairy chested" solution.

(Goes to show, there's a few other approaches possible as well and I am absolutely overthinking the issue.)
Cheers,
Greg
P.S.: Have a look at my blog and you'll see what I mean... I went all the way with fixtures etc. and honestly I am not sure my final outcome is that much better than yours.