I built several simply using Sheldon Browns’ guide and some zip ties on the fork leg, and my fingers to gauge spoke tension.
I’ve no doubt they could be built to a higher standard, but mine have lasted just fine. I think this is because i’ve not gone super lightweight so there is a margin of error (rather than me having exceptional wheel building skills)
I’ve built mine using Novatec hubs, ACI DB spokes (i.e, nothing triple butted and 1.5mm thick) and mid-weight rims (e.g. in the past i’ve used Halo Aerotrack for disc road wheels, or Arch EX for MTB).
I also built some using those 288g road hubs on eBay, however the front 24h wheel came out a little flexy, and the rear 32h started breaking spokes after a couple of years. Nonetheless, they survived two seasons of racing, cost < 140 quid, and weighed around 1500g.