Saw Stu Thomsen posted this on FB a while ago and had to grab it. Too cool of info to lose over there.
as quoted by Stu :
These are photos of my old Huffy . Hadley and I were given the green light by Huffy to seek a local frame builder rather then sending our designs to Ohio. I gave what I wanted in design (demensions) to the frame builders at GT Bicycles and this is what they built. Didn't need anything fancy or cute in design.
19.5 TT C/C Chain stay 15.5 center of BB to center of dropout. Seat mast 10 1/8 C/C 4" head tube with small enforcement ring. 1" diameter TT tubing 1 1/4 diameter Bottom tube I don't have forks so I don't know what the rake is nor do I know the BB height.