this frame is constructed out of 1x1x1/8th and 1x1x1/16th inch tubing
and the holes are for mounting some things not for gas since the endes of most tubes are with open or have a little slit left after welding. I designed all of this in inventor and we still have some interesting parts to put on such as some
dewalt threes speeds yes yes
edit: and yes its for a crab drive