I'd say the shell is worth $1500 as a package, with the HT. I'm assuming you will be retaining the title for the exocet, so you really only have some misc parts and a large chunk of metal that someone will have to recycle or dispose of. You can probably make an extra $500-$1000 by doing a part-out, then selling what remains to a Mazda scrapyard or maybe TDR if there is enough decent stuff left to make it worth their trouble. I'm fairly certain they would buy it from you as a complete shell if you choose not to sell off the goodies first, but they might not have much interest if its picked clean.
Curious as to why you'd keep the rollbar for an exocet?
If you do decide to do a part out, I'd have interest in some of it. The HT is obviously the majority of your value. You didn't mention the condition of the softop. If you want the most $$ for the least trouble, sell the HT by itself and the rest of the car to TDR.