I would seal it, I don't think I sealed the outer seam and I have a leak! Doh!!

I have dome lights if you need one.

I also sold a rear plug with interior insert for $75 at Carlisle. So not crazy expensive to build.

Good Luck!! Sounds like you have almost everything! I would try and utilize the numbers block if you want a 318, if not go for anything! i wouldnt keep it around unless you have the room though.