For an idea of what a sprite or midget restoration will involve have a look at the ones that I rebuilt.
http://www.mig-welding.co.uk/forum/album.php?albumid=743
http://www.mig-welding.co.uk/forum/album.php?albumid=724
Oh boy that brings back memories! My second car was a Frog Eye. Swapped it for my first car, which was a Morris Traveller. Back in 1972 I had to cut out those two channel sections in the foot wells and re-weld new in, but I had no welder. I actually wound a transformer using the existing primary and a heavy secondary from cable, and arc welded them in. Not easy but I got it throught it's MOT !!! How much easier if I could have turned it upside down like you. 680 ERL was the plate if you every come across it !!!!
AWEM