yeah you cut the tubes down with a hacksaw but it helps to have a saw guide, i made one out of angle iorn and i clamp it in a bench vise and then clamp the tube to that.

looks like..___________ _______________
...................|.................| |......................|

except for the slot is only blade width and then you clamp your tube to that.

and no you need an oxy-acetaline torch which you can rent from a welding shop if you dont have access to one.