Building your own clubs - Proswing or other suppliers

I built my own clubs with my uncle about ~20 years ago when I went off to college and I still use my clubs today. After not playing for a while, I've started playing again and my son needs new clubs.

My uncle introduced me to the whole club building process and, because it was 1998, we ordered via catalog from a company called Proswing. I believe Proswing was in Ohio but I can't recall for sure.

My son is 6+ now and is too tall for his first set of 4 clubs he got when he was 4. We want to build a new set together but I cannot find Proswing anywhere on the internet, only a mention of a trademark/patent dispute with a Candian company 10+ years ago. Most of Proswing's stuff were clones of other major brands, so infringement wouldn't be a surprise. I still have my Trident clubs (and look just like Callaway at the time.)

We'll probably build 4-5 clubs (a ~3 wood and a 2-3 irons, probably 5, 7 and 9 or a wedge) plus a putter and expect to do this several times as he grows. If anyone knows what happened to Proswing or other outlets to buy club components, I appreciate your help!