I think Ceriatone sell some Matchless kits: Spitfire, Lightning, DC30.
I'm actually in the middle of building a combined Spitfire/Lightning but it got put to one side for a while while we were having a referendum here in Scotland. The two circuits are very similar so you can easily build both in one box with a few extra switches.
In fact, there's a lot more you can do along these lines. The power amp is almost identical to the Goldtone GA15 so you could split off the power amp into its own box and build separate preamps for the GA15 and Spitfire/Lightning.
The same set of trannies can also be used to power a dual 6V6 amp. So you could add a second power amp like the cathodyne PI design used by the Divided by 13 CJ11 and 5E3 Deluxe and now you're in 15W heaven with five highly desirable boutique/classic guitar amps.
Ask me again in a few weeks if it actually works
Just a Spitfire/Lightning on its own though could be a great little amp if you're looking for something Voxy.