So these were 3 sites I've been poking around. They have a wide variety, but basically they are the same. They are also relatively cheap, so screwing one up, isn't gonna send me into a state of frustration, and anger. These, are them.
https://www.solomusicgear.com/
https://thefretwire.com/
https://www.pitbullguitars.com/
They have a decent selection and they also have skill level recommendations. If I drop $200 including paint, and sell it, I'll ask for cost, and be happy for the experience. Or give it away to someone that wants to learn, or tinker. The goal is to get good enough to do set necks, and minor custom work. For instance, I want a double neck bass on bottom, 12 string on top. Maybe I can rework the kit, and adjust the lower part.
Now I priced out a Squire Affinity PJ bass, and swapped the bridge to a hipshot hi mass, the pick ups to Seymour Duncan 1/4 lb. pick ups. (Roger Waters used them on his signature bass), and locking tuners, and it had an alder body, maple neck, an Indian Laurel fret board, which I DO NOT LIKE, and it came in about $750. The Mexican Fenders are about $800-$900. and Fender American's are around $1,500 bucks, so that's a toss up.
Now THIS site, intrigues me.....
.
https://guitarandbassbuilds.com/?gclid=EAIaIQobChMI77n8uKXG8gIVzGxvBB3JXgX3EAAYASAAEgL-cPD_BwE
I've poked around, and basically with pick ups, tuners, bridge, etc., which I would put on a body I priced out at about $550, in combo with the $250-$600 dollar Fender necks, I've just made my own Fender American. But these people will make your body how you want it. So you can build a Strat with the humbucker in the middle position. Or I can have that rear single coil slot widened for a humbucker. They'll even finish them for you.
The thing is, I like a Fender basses, but I prefer a 2 top, 2 bottom tuning peg arrangement, and the only people that seem to make really good necks, make them in the Fender style, because they're bolt on, and it seems they may have a standard measurement. If the heel fits the 6 string slot on the double neck kite, I'll go with left handed, so I can fit my paws in there, to tune up.
In my opinion, Mike Rutherford's Shergold double neck, was a great example of a good shape. But I think I would have a problem with the control layout, and his guitar was a bit odd in it's set up, but for shape, and configuration, it's a 10 for me. It's close to an Gibson in shape, which is the only other one I like.