There are a lot more kit cars out there than just the “7” types.
It all depends on how you want to build them. Westfield do a modular build which you get everything from the factory, either in 1 go for around £17k or as separate modules as and when you can afford to buy them. They also do a Single donor vehicle kit based on the MX-5.
Things have progressed from the sierra/ cortina era.
Its like bikes, what do you want to do with it? Just get out and ride, or do you want to get into hillclimbs and sprints, autotesting, or track racing/trackdays. How much have you got to spend. A good second hand westfield is around the £8/9k figure.
You could build an Ariel Atom, but will cost a lot of money, how about an AC Cobra replica amongst a whole host of others.
The Sierra/ contina way was the best way of keeping costs down. You can build from a donor vehicle and keep the reg from that vehicle, or biuld one and get a “Q” plate. or buy brand new components and apply for a brand new registration, but will have to go and pass SVA or IVA rule/regs, which is a pain in the neck.
Best thing to do is go and buy a few of the kit car magazines, and have a read, maybe look out for a car club near you that has regular meets, usually in a pub car park, and have a chat with the owners.
I used to have a westfield, but have been out of the scene for a few years now.
I would definately recommend building one, and hopefully when my kids are a bit older and I’ve got a bit more cash, I’d like to build another one.