another question.

Bolting a frame together, prior to weilding or bolting instead of wielding

Am thinking that i could probably make a JIG for the bolt holes, and am confident that i could make the machine straight and true with bolts. and then just tac it were required, once nearly assembled.

I have been mainly thinking this because my X will have an overhang, were the rails will be placed. and am thinking that, at least that bit, will be easyer to get exactly level, by bolting and shimming first.

Again, nobody seem to do this, and it seams a no brainer as an easy way to ensure a straight and level machine, but, its probably me not engaging my brain, am open to any opinions on this,