Home-brewing your own radio equipment is something that ham radio originally had a lot more of. Though there is still a lot of making custom antennas in the hobby, very few people are making their own radios these days.
But there are still a few nice radio kits you can grab and finish assembly on, as well as various more or less complete schematics for other types of equipment such as antenna analyzers.
Here are a few of the better ones I’ve discovered out there:
Nice multi-band QRP transceiver kit which comes with most of the surface mount parts already installed on the boards. You will have to wind some toroids, and install some larger through-hole type parts. You can order the kit without a case, or with one. The project is open source.
A general coverage, 10 watts HF SSB/CW transceiver kit. It works from 3 MHz to 30 MHz, with up to 10 watts on SSB and CW, with a very sensitive receiver. Finished project has digital tuning, dual VFOs, RIT, and CW Keyer.
Comes with almost all parts installed on the circuit boards, including the toroids, which are hand wound in India by a group of ladies. You will have to get your own case, and provide a few small parts like knobs.