You can also build the Daytona kit as a coupe (fixed-roof hardtop). If your donor has T-tops, you can leave those in place. For coupe builders the rear tub includes molded-in side panels that go around the quarter windows.
Robert Nassry's Daytona ZX™ Spyder was built by Chris Sterling @ HPE in Costa Mesa, CA (www.hotpro-eng.com). It's built on a 83 280ZX Nissan donor car but features an aluminum GM LS1 V8 engine and a T56 transmission.