518 is in!!!

Well here you go. He cut the original crossmember tie out and welded in a wide thick strap that he welded to the underside of the tunnel and tied it to the original crossmembers. He then refabricated the trans mount to accommodate the new trans. Note where he welded through the floor to tie in the new strap.

The subframe connector is 2x2 box channel. He cuts a hole in the front crossmember and slides the connector in the hole, then welds everything up.