I hesitate to call it a kit since the entire board is pre-assembled. Only the external components need to be added and they are all included with the board - even a tiny microphone element and four stand-offs for mounting the board.
Six wiring harnesses included as well, with headers at one end to mate with their board-mounted counterparts.
I had been hoping to install it into a Ten-Tec case I've had for ages but I think the case is just a tad too small. Fortunately, there is a Fry's store nearby so I'll be heading there tomorrow to pick up an aluminum case of appropriate size.
Looking at the board, I don't mind confessing that I'm glad the coils are pre-wound as there are a number of bi- and tri-filar transformers and a few inductors wound with very small gauge wire on small toroids.
All of that, with shipping included, for $45.
Other BITX40 info can be found here:
BITX40 on Solder Smoke blog