Tunnel Part Duex

So Part 1 is basically complete ready for welding. Couple of tweaks needed but goes in and out just about perfectly. Its totally solid and rigid.
Can eventually be welded all around. With the double lips, double welded it should add some stiffeness to the general area than a piece of cardboard or fibreglass never would, it will be bolted in with M6 bolts in 14 places and 4x 7/16th.
Below will get tig'ed and ground back too.

Now I shall devise the rear section, but not the removeable piece. Need some materials and planning first though.