The best is yet to come
This is the 2nd design I made. Here I started having 25th frets. The first fret I sacrificed as a damper place. When I capo the 1st fret on the bottom neck, I'll get normal guitar with open strings with normal 24 frets.
I changed the headstocks to be simpler, they are basically simetrical. I used small full line machine head sets left & right. Also I made holes in the midst of the headstock to insert in the 7th tuning peg. I'm quite happy with this overal head design.
Learning from the previous lesson, no point having "bendable" complicated bridge; no hand to pull the whamy bar as both hands would be on the fingerboards; I just used simple fixed bridges.
I moved the low waist higher, so that I'd get the guitar's position's quite low when I put it on my lap. With this position, it's easier to reach the whole top fingerboard with my right hand.
In order to release the tension on the neck from the previous problem (read the sub-page before), I made a long horn to attach the strap. It worked well to keep the guitar in low position while the necks tilted up, but I still found it's heavy (though I made a hole in the body to reduce the mass also). I wonder if I could design a new one without the long horn and yet still make the necks tilted up & low position.