Are you suggesting that a 25mm body will need a truss rod?
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Ha! No. I just thought it was funny that you said necks were "holding up fine" because they're not. Without the rod they'd be bananas. It just sounded funny the way you made your comparison. That's why my first point was to agree with the feasibility.
But it is true that guitar bodies can move over time. I've seen many guitars get a slight bow to them. Sometimes it manifests itself as less pullup on a trem, because the bridge has to sit a little deeper. Sometimes the pickups and/or T-o-M bottoms out. I've seen it on SG's, Sabers & Stealths, Melody Makers, etc. I started looking for it a long time ago with straight edges. I was interested in the effects of years (and decades) of string tension. Somewhat of a "the anatomy of vintage" study. Wood moves over time anyway. So while you couldn't say string tension was responsible, I never saw a body that bowed backwards. So to this day, I design my guitars with the bridge to have ample downward adjustment, like even until the strings rest on the fretboard. Byron, you'd be wise to do the same.
Also I'd go with an Ibanez style barrel jack. It solves all your problems. You would even have room to recess it a little, and recess the control cavity cover. There's room on that guitar for vol/tone pots, too.
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Frank is what you mean about the jack?
Stew Mac Flush Mounted Jack
I've just ordered a couple for my current projects and thought it might be useful.
With regards the vol, tone pots, one of the reasons for not putting them on, is because I very rarely ever use them. I mostly play hard rock and metal rythm, and the bridge pickup is always selected on full vol and tone, never felt the need to change them, and I quite like the idea of having a super simple, plug-in and play type of guitar with very clean lines.
If this project works, i'll do another with full electrics, (need to practice electrics, I can barely use a soldering iron :-)
Thanks for all your idea's, and i'll take note of the point about the bridge..