Oops.! Touched a nerve there...
I was going to offer the loan of my Crochet hooks, but maybe Macramé would be a better option.?
Seriously mate, starting from scratch is not so silly an idea.
I did a T140V from scratch once, as the original had been so "macramied" and I wanted some custom features anyway.
I laid the original out on a big board, using nails either side of the loom to peg it in place and draw round important bits. It's fairly straightforward to lay new cables into the "nail bed" following all the original branches and lengths, incorporating mods along the way using the original as reference ... Bit more length here, bit of slack there, as required.
I used new connectors where possible (not very complicated on an old Triumph) saving anything specialist to restore/re-use.
I think most of the original fitment connectors can be sourced, just a matter of knowing what they are called.. Plenty of knowledge on here. If you post a picture up, someone will be along pretty soon with the correct name and probably a source too...
Oh and I used S/S braiding on chafe prone areas about 30 years ago. I'd seen it used as RF shielding on boat looms with Radars ect. So I employed a few "offcuts"..
