Fingerboard Ramps Does Any Body Have A BIG Halfpipe That They Use For Their Fingerboard(s)?

Does any body have a BIG halfpipe that they use for their fingerboard(s)? - fingerboard ramps

Me and my dad plan for a building 12in. 36in high. wide and 13in. between the pipes. Will also fall to the ramp, and two pieces of pipe is an inch larger than the normal size of the ramp. We have listed several types of wood, but I'm not sure what kind of use. All proposals (what type of wood used)?