I'd definitely do this and take a bunch of really good pictures. Maybe add some production numbers on the color combo of that year or whatever to reinforce it being a collector car instead of a build platform.
There have been some pretty high reserves, even lately seen a few NMR and these were bid to 'market' price
I'd rather put it on reserve and see where it goes and have it done in a week vs autotrader and wait for God knows how long and the endless bickering
With BaT you have (mostly) folks who are serious, have money, and are LOOKING for this sort of car.
I would suggest seeing if it sells on Autotrader before putting it on BaT. You have to put in a lot of work and be able to answer question very promptly so you are not accused of being a non-responsive seller. Also, don't forget to get your film school grad talents ready to produce a nice quality YouTube driving video. It seems to be what the buyers on the website now demand. Oh yeah, thanks to Wheeler Dealer, be prepared to answer if the HFH, HFHOE and timing belt has been changed recently. After Mike and Ant restored an SW20 a couple of seasons ago, the public at large now believes those hoses will explode without notice. Not to mention someone will post their snap oversteer nightmare to your auction thread. Finally, you have questions being asked in the frantic last minutes of the auction that you previously answered days ago by a dimwit that did not bother to read all the comments beforehand.