Hi Chris,
+1 for Allen's perspective. I think the $80K ballpark is reasonable for the low-average range. Given your 400HP range and "daily driver - non-track" use, crate engines and transaxle choices will be somewhat less expensive. The fit and initial finish of Fran's bodywork is quite good (Look at Alex's polished gelcoat on his SL-C) which will translate into less prep time (time=money) for the body shop. You probably wouldn't need to consider roll cages, dry sumps, big brakes and the like for a street car. I agree to go for the Deluxe version. But figure in some upholstery work unless your skilled at that part of the build.
Time: I visited a nationally renowned custom hot rod shop in little Cumby Texas recently and yesterday I spoke with one of his potential clients. This shop does hot rods, many destined for the show circuits, all metal bodies only. Their work is outstanding. The owner said there is a TWO YEAR waiting list to get your car back! His shop is absolutely full of original bodied hot rods in all states of completion and he has a large staff of skilled workers scurrying around his shop. The potential client is much like the majority of builders on this site, history of working at a Porsche dealership, semi-retired with time on his hands, not an unlimited budget, used to own a 41 coupe and now wants a custom 41. He thought "well if it takes this guy in Cumby two years before I get my car back, I can get the job done before then". Wrong! He has been at it for five years now.
But is he dis-satisfied? No. The "journey" is just as rewarding as the finished project. I showed him my SL-C project, body off, parts everywhere, welding table with scraps of aluminum, etc. He instantly could relate to why I am still satisfied with my "turtle-slow" progress because it's MY journey. So, I guess I want to say "the importance of build time is over-rated".