Bench to bucket conversion, need help please

Thanks all for your info! I really appreciate it. I can make the plates from scrap steel from the shop I'm at. I'll have my friend with a welder come by an tack them in. The shop im interning at builds spec Miata's for SCCA and all our seats and belts are reinforced with plates. I'm a visual/hands on guy, it's best way I learn, thanks for all the pictures. now I got a clear idea what I need to do