RSR help

Im going to try and make a rsr so i need the dimensions of it

height - top of canvas to bottom of ring
Size- area of canvas(i think its 17' x17')

Height of the turnbuckle- from where it goes into the ring and to the top of it.(will a normal set of turnbucles do , the ones from the action ring)

Any other measuements ill need to make it to scale?

Any tips for making one?

Thanks for any help

s