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Cut and Combine

I agree with Bruce, cutting and joining a straight line is going to be MUCH easier than a curve. Also as far forward as the body of the SG is, this thing will dive like the Red October. I've have an unfortunate experience with designing a bass that dove so bad it was uncomfortable to play. I spent a LOT of time re-designing it to fix the dive.
 
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Like the title says I want to cut and combine. I have asked a couple luthiers in my area, they wont touch the job. So I'm either looking for a luthier in the Tampa, FL area willing to do this for me or instruction and insight as to how to accomplish this myself. Thanks!

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I think that the long upper horn of the bass is required for balance, so the bass has to go on top

Not necessarily. You can put the guitar on top, but you have to shift it forward enough that the guitar's strap horn tip is about even with the bass's 12th fret. Or, you can add more of a horn to the guitar body.

I have a beautiful custom Carvin doubleneck from the late '80's which has the 4-string bass on the bottom and the guitar on the top. It's heavy, yeah, but it's suprisingly balanced and ergonomic to play. It's the only doubleneck that I tried, back in those days, which actually could be played for a whole gig.
 

I don't have a picture handy, but mine is much cooler than that. It's all black with inline pointy metal headstocks on both necks. And the two headstocks line up. Plus I fitted a Floyd tremelo on the guitar with a custom low profile arm. DiMarzio's on the guitar and EMG's on the bass. Back in the days when I was just tinkering with guitars as a hobby. And listening to prog rock. Couldn't play guitar much at all, but I just had to have a doubleneck! I found it in Carvin's store on Sunset in Hollywood. It was a one-off cancelled custom order. I paid $1100 for it. I still own it.

It's the only doubleneck I've seen that looks super cool and is reasonably comfortable to play. To me, having the bass on the bottom makes more sense in playing either neck. I don't understand why, but most people disagree, and most bass/guitar doublenecks have the bass on top. That seems to me to be more uncomfortable for both necks.
 
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Straight cut it is. 3 5/8" between necks. Let's hope I cut straight. Not happy about having to rout a new chamber for the bass electronics >:l

On the upside, when I was looking up the SG I found out it has a killpot. Neato.

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Straight cut it is. 3 5/8" between necks. Let's hope I cut straight. Not happy about having to rout a new chamber for the bass electronics >:l

On the upside, when I was looking up the SG I found out it has a killpot. Neato.

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If you do a straight cut like this, were you thinking of shaving the bottom even like this:
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Edit: might get kind of close to the output jack.
 
I vote don't do it.

Reach out to Ben and Mick at Guitar Repair of Tampa Bay.

They have the tools and experience to make the best of whatever you decide to do.

They were the only ones in the Tampa area willing to do the work, but it was going to cost more than a new double neck from china or a used one domestically.

I'm gonna cut these shagers and make a badass bitch.
 

Alright! You've made the plunge! You are probably already appreciating why we recommended the straight cut. It'll be much easier to get the two edges straight and square and fitting together right. Get that joint right and then figure out where you want the bass controls and cavities, so they don't interfere with playing the guitar.