Some folk cover the floor & tunnel, others have just done the floor.
I used 2mm alloy for the floor ( Left tunnel open ) & have bought 1.2mm for all of the rest ..... Rear panel done, went round the corners a treat
Side panels & interior next
I bought a full sheet of 2mm .... Had enough left from that to make my fuel tank
Yes alloy rivets, the sealed type if possible .
Went beserk with my rivets ..... Every 25mm
.... One thing for sure, the floor don't bend when I stand my 14 stone on it !!