It seems that many people are interested in converting a guitar into a bouzouki. This does not appear to be particularly difficult. To get around the problem of string suspension with the pins, you can, for example, attach a new tailpiece. Of course, two additional holes have to be drilled in the head of the guitar. You can either simply drill two holes at the top of the headstock. Or you can go to the trouble of filling in the six existing holes and drilling eight new ones, which certainly looks much better.
Then the bridge insert and saddle need to be converted to 8 strings. Particular care should be taken when working on the saddle.
In any case, it should be noted that the fingerboard is very wide compared to a bouzouki, which will certainly not appeal to everyone. Personally, I would find it too wide. I am also not a fan of the sound of the gizouki, or whatever you want to call it. But that is all a matter of taste.
Here's a website where a guy called Keith Hempsey shows his conversion of two guitars.
