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smilie in place of the real @
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I'm also replacing the area under the drive shaft tunnel because there are so many rivet holes it just makes sense.
Replacement floorpan sections are fairly inexpensive from usual sources. The DS Floorpan is not flat. There is a depression for the footwell and mounts are needed for the gas pedal. The panel has a couple of ribs in it to add strength. It is fairly simple to replace. A rotisserie is nice, or if drivetrain is out front and back, the car is down to around 400 lbs. and it can be carefully rolled on its side, so it can be welded on bottom as well. I'd be very careful removing the transmission tunnel. This is a major structural member and careful bracing is needed before rewelding. Otherwise, doors will not close and car will not track straight. I'd consider tunnel patching vs. wholesale removal. Sounds like DPO screwed up this car. Your job is not to screw it up further. Safety first. I'll defer to others but be careful before cutting. A couple of good You Tube Videos out there.
A Bugeye has significant upside Resale Value if restored correctly. A really well restored Spridget has a tough time getting $4-5k max. A BE in the same restored condition will be $8-10K with perfect examples commanding over $20k. One of the contributors to this forum with an absolute perfect Concours quality BE sold his for > $25K. It all depends on where you want to go and what you want to do with "YOUR Car". A BE replacement floorpan around $150. Yes more expensive than sheet metal but it fits, and is correct for the car. We can't tell you how to spend your money but we can advise you on how the get the most money for it when you decide to resell it.