i know what you mean about having stuff looking good, im the same way. when i snorkeled my rubi i used 1.5" flex hose but i have seen people use 2", i think its just what you want to use i dont think it really matters. as for the fittings, it all depends on how you route it through the bike. when i did mine i didnt use and fittings because i used flex hose. sorry im not much help but it just depends on how you want to do it.
-Aaron
-Aaron