I'm hoping for a Robin Mather frame (if it all works out!) - not that I've thought about it much at all, oh no, but maybe done a bit like this (off the top of my head, obviously)...
*brazed frame with no lugs (not even at top-tube / seat-tube / seat-stay junction)
*singlespeed with dropouts that have metal (as in not painted - stainless steel?) faces where the hub (a Full Monty!) bolts on
*26" wheels and clearance for tires up to 2.5" wide (80mm total clearance?)
*classic "old school" mtb shape
~NOT suspension corrected*maybe reinforcing ring on seat-tube? (like soulcraft)
~top tube parallel to ground
~nicely curved tapered unicrown (?) front fork (again with not painted dropout?)
~kinda long (tall?) head-tube (but not too long!)
~equal (tightish) clearance for front wheel from down-tube and rear wheel from seat-tube (shortish chain-stays)
~the same clearance on front wheel to sides of forks and on rear wheel between both chain-stays and seat-stays
~built for canti brakes only - rear hanger brazed to frame, front hanger brazed to stem?
*maybe reinforcing rings on head-tube? (maybe like old mountain-goats?)
*round bottle mount reinforcement brazeons (not diamond shaped)
*braze-ons for front and rear fenders and rear rack? (round and brazed to frame, not into frame)
*cable routing using Surly style zip tie braze-ons to allow full cable outer
*camouflage paint like Ritchey Commandos had! (I figure this may cost a bit!)
*custom or Salsa steel stems painted to match bike (two stems, for different handlebar styles); with canti hangers brazed on as mentioned above
*brazed on seat binder that takes M6 bolts (maybe!)
I figure I'd like the bike to have a two-speed freewheel and two front chainrings - meaning I can get two gears with the same length chain. I think I'd go for 38 / 41 up front and the ENO 19 / 16 freewheel behind. 2:1 offroad and 41:16 on! I'd maybe like a Chris King steelset headset, but I'm not sure.
Anyhow, it's nice to dream (and to make cost / weight / value per km spreadsheets, apparently)!
all of the experts say you've got to start them young
MKM Dominator 1977
Kona Explosif 1994