Originally Posted by
Noice
90kg (200lbs) with a planned frame size of about 22" maybe 24". However, I got these thicknesses from a video about bike frames which were using mild steel. If your interested, here's the link
www.youtube.com/watch?v=fL25BYkA6Xw
You'd be fine using 0.9mm walls (or in your case, 0.889mm) straight gauge for everything. Ordering butted tubing from Nova would save a little weight, but probably not enough that you'd notice.