I'd be happy to talk with anybody about my Espar gas heater, but I don't think it's going to get at the root of what's eating Tom. I'm pretty sure the major problems he's experiencing are related to air and water leaks, although we have never spoken.
I didn't know for sure how this whole thing would play out ahead of time, but based on my experience trying to make a JPS speedster more weather tight, I was reasonably sure that this coupe would leak a lot of air and water from places besides the top, and as a result fall well short of the original goal of an all-weather replica.
Contrary to popular thought, the main impediment to using most CA built replicas in cold and wet weather is not the top and side curtains. These can be modified to seal reasonably well with a bit of work (I outlined how in a post about 5 years ago). On my JPS, air leaked around the door frames, in the hood hinge holes, up the tunnel and out the shifter and e-brake, and most importantly: at the pan/body junction just aft of the access panel in the frame horn area.
I worked diligently to seal up these leaks without any real success, and I'm a persistent guy with a strong mechanical background and access to a lot of tools. I pulled up the carpet behind my seats, and shot three full tubes of silicone in "the crack", and John uses spray foam where a lot of builders don't. Maybe some ice and water dam would have helped, but then the carpet wouldn't have fit correctly. The problem is in the design of this area, and the fact that it can't really be fixed after the body has been joined to the pan, and certainly not with the transaxle in the car. There were many (really, MANY) other leaks, large and small. It was like whack-a-mole, only I couldn't really ever get Punksatony Phil back in the hole.
On the surface, a replica coupe seems like a great idea. But the world doesn't need a leaky coupe any more than a submarine needs a screen door. Sacrificing the best of what's good about a speedster replica (the top-down part), for no functional difference as year-round transportation in the rust belt seems to fall pretty far short of what a likely coupe buyer is looking for-- and yet it is what I fully expected from this project.
In my experience, folks from Southern California have no real perspective on what cold weather really is, and as a result make compromises that no midwesterner (or easterner) would ever consider acceptable. It's not malice, it's just ignorance of what is required.
Even an Intermeccanica with an Espar gas heater isn't going to be a 12 month car in the midwest, although it comes worlds closer than both CA built cars I owned before.
As I said here during the conception and incubation of this project: forewarned is forearmed.