You can get teflon lined braided hose from Grainger with ends already on it.
I put a combo check valve/unloader on mine at the compressor. You don't really need the unloader with this setup but I would do a check valve.
I have my oil trap up on the fire wall away from the compressor. The air is a bit cooler there further from the compressor - more of the oil will drop out and the polycarb bowl should last longer with less heat.
My shut off switch is set to 100 psi, I think it comes back on at 80. Make sure you have a safety relief valve in the system. I have two quick disconnects on mine: the one in back is most convenient but the one under the hood is handy when the rear one gets crusted up with mud or ice. I've got a 2 gallon tank mounted under the rear floor.
'03 KTM 450EXC
"If you know what you're doing, then you aren't learning anything." - A. Lincoln