Bob: I did do the interior myself__first time ever doing seat covers__so there were things I had learned, and would do differently the next time around! I'd already done carpet & door/side panels sets in other LBCs (MGB & MGBGTs and a TR4) so those areas went really well on the Healey, but I should've used some upholstery foam between the seat covers and the molded cushions (instead of carpet padding__SMH__) to get smoother lines.
I considered those to be my starter seats all along, so they're vinyl instead of leather. At some point, I'll redo them with leather, correct padding, etc.
I had a single issue with Moss on the 2-seater specific rear side panels, in that the wooden pieces were assembled incorrectly__the RH structural piece was fitted upside down to the LH panel board and vice versa. ONE (1) phone call, with a detailed explanation and new pieces were shipped out pretty quickly__they're not "stocked items" so they had to be made again__but still done as a First Priority and I'm sure I received them inside of two (<2) weeks. I was satisfied with their quality, initial shipping time__again, kits were made to order, and it was during one of their frequent upholstery sale promotions__and how well AND QUICKLY they handled my problem.
For anyone else doing a 6-cyl 2-seater, the rear quarter trims are unique (to the BN6/7) and did require some additional shaping (by cutting & sanding) the wooden pieces adjacent to the door's B-pillar. My only real complaint was that the vinyl was already glued down, so that required some careful peeling back before I could whittle away at the wood (a little bit at a time, so as to not go too far...). Had I known that before the replacement qtr pnls were sent, I would've requested them in a partial state of assembly. It really wasn't a big deal to correct, and after spending time on the first side, an hour at most, I was able to sail through the second one.
I took A TON of pictures while doing the interior, so may be of benefit to someone else doing the same job:
https://spcarsplus.com/gallery3/index.php/Healey-at-home/Interior_Makeover?page=1
The masking and books for when the seat cushion pleats were glued down, and 50Lb sack of corn for the backrest pleats should be the best take-aways of the pictures! And DON'T use the carpet padding foam__all I could find local on a Friday night__between the seat covers and foam cushions (you'll see what I mean if you think you can put the covers directly on the molded foam__the originals had some sort of padded cotton/linen between them for smoothing).
You'll want to have a huge assortment of spring-loaded gluing clamps on hand, in lots of sizes, and I used a large quantity of paint-stirrer sticks to "pad" between the clamps and vinyl.
Trimming the wood to get the rear qtrs to fit...
Taking a little slice at a time!
Finished and fitted (what looks like a lump is a reflection off the chrome s/screen wingnut)
Masking and gluing pleats
Weighting them down overnight, before continuing assembly
Ditto the backrests (I had the corn on hand for feeding our ducks...)
You have to be in the right frame of mind doing the interior, and if you get frustrated, WALK AWAY for an hour or so; for the best results, I needed to be patient, and take my time.