Welcome to the group Barracuda.
What part of East Texas?
Aircraft Spruce is a good source for the tube, I bought mine in 8' lengths so it came UPS ground. You have to splice it but it saves on cost. Just do a take off from the plans, only take a couple minutes. I bought extra 5/8" and got a volume discount,10% i think, just on the 5/8. one box weighing 48lbs had all 4130 for the fuse with considerable extra for practice.
I like your engine choice, same here, we need to collaborate on the install. Not much out there on these.