Thanks, Don. I've seen aluminum forks with threaded steerers for road bikes, but not MTB. You have a good idea though; I may try to build from scratch maybe with an Electra cruiser or another Bikes Direct. Looks like I'll have lots of time with the current lock down in CA, so need something to keep from going crazy. I really like the causal frame geometry of cruisers after not riding one for (YIKES!) many years, and may continue with the 26/29 wheel orientation.