once the centre pillar was removed the entire middle of the car buckled and twisted out of shape with all of the doors popping open lol.
How about this, the last one i cut up when I took the roof off I left the windscreen frame and doors in place and it looked really nice as a convertible. When I took the doors off I expected it to fold but it didn't. I decided to see how much it would take to bend it and no matter how much i danced on it i couldn't shift it. When I lifted the motor out i sat it on the floor right in the middle and STILL it wouldn't bend. The sill shape and tunnel shape and structure is so rigid I reckon it wouldn't need much to get a cert for a convertible conversion. Then of course you have the hassle of getting a rag top that would look good. No problem if money is no object I suppose but I'm not in that league.
However many congratulations to you for destroying the odd Gemini, I got nothing against them or their owners, I used to have one myself a few years ago and it was a rocket ship but it is important to keep a balance for all the Piazzas that have been sacrificed for Gemini upgrades.
I have to own up here that Madmike and I did part out a Piazza JR130 that really should have been saved but sometimes you can't avoid it. The others I have killed have been beyond all hope. None of the parts recovered have gone to anything other than another Piazza or tucked away in our respective sheds for future use.