i could swear i made a thread about this a long time ago...but nothing in the search. but anyways this time its different because i'm actually working on it and not just speaking hypothetically so for a while i've wanted an instrument that could change fretting templates to whatever i wanted, rather than being fixed to one scale. i've had the chance to play on a guitar that actually had this ability - the fingerboards could be attached/detached by use of magnets. works great, but the official kit is too expensive (the kit i'm referring to is a descendent of the Tom Stone 'Novatone' fretted/fretless bass deal, if anyones familiar with it). that particular setup has a sheet of ferrous sheet metal glued to the neck, and under each plastic fingerboard there's a sheet of magnetic rubber. i just received today an order of magnetic sheet rubber, as well as a sheet of 'receptacle' sheeting, which is non-magnetic but ferrous rubber. as it turns out, even the weakest sheet attracts very well...its easy to peel off, but very hard to slide laterally, which was what i was looking for. also the back of the magnetic sheet doesn't seem to attract bass/guitar strings at all, which is good because i was worried about string pull. so my plan is, glue a piece of the receptacle sheeting to the neck, and each fingerboard would be made out of the magnetic sheeting glued to some rigid playing surface... ...i should also mention i have a supply of special fretwire, that's essentially tang-less.the bottoms are flat and are meant to be glued to fingerboards. its from the official kit i mentioned above... so the main issue i'm facing right now is what to use as the playing surface...i'm looking to keep the whole setup to around .10 inch thick (also a measurement of the official kit), because that will be the amount of wood i'll need to take off the fingerboard. i was hoping to use some kind of plastic...i can either order 1/16" plexiglass, or .020/.030" styrene sheets. i have no idea how this stuff handles, because i've never seen plastic sold that thin. it needs to be flexible, so that the 'fingerboard' can match the bow of the neck and achieve a solid connection. but not too flexible, because i don't want frets popping off if it bends too much. anyone work with this stuff before? but in the meantime, i should start working on the neck. i need to get it completely flat, and take that .10 inch off. so how to do this? should i plane it, or should i use some elbow grease and sand it? and if planing, how would i go about that (not at all familiar with planing)? i guess this is a bit long but there's a lot to say...and reading back over it looks confusing. anyone have advice?