Hello. As part of my quest to design a dual-setup bass, before I can get started I need to decide between two basic ideas. 1.) A headless doubleneck. One neck setup for the more pristine sound, cleaner tone, standard string guages, deep-tight tones with no rock-bass tones. The other neck set up more like many 70s rock basses were with low action, a bit lighter strings and a bit of fret buzz. Headless to keep the weight to a minimum. ~OR~ 2.) A 5 or 6 string strung with a "standard guage" E and A string with a bit higher action for the cleaner/deeper/tighter tones, and the remaining strings to be set up like the rock bass neck of the doubleneck. So if it were a 6-string it would be strung something like this: E105-A85 - E85-A65-D45-G32 (if 5 string is chosen delete the E85). Almost as if it were two separate necks. The two lowest/fattest strings are for low groovin' and longer tighter sustain, the remaining four strings set up for a bit of fret buzz, shorter note duration, and thinner more "riffy" strings Obviously the single necked 6 string standard-headed bass would be lighter and less costly than a doubleneck headless rig. So if at all possible it would be my 1st choice. My Point: The question here is can that double-setup 5 or 6 string idea work without odd stresses on the neck or perhaps other pitfalls I haven't thought of? I plan on using Warmoth to supply the neck and body. I would suppose the nut would have to be properly filed to make that work as well. I've been planning on using a brass nut (my Cort A4 has a brass nut and I've grown to like it). In either case, this will be a 2-channel output design, no onboard preamp (other than simple volume controls) to be used with a custom foot sweepable pickup selection system. My foot will perform the exact same function as a pickup mix knob does, allowing me to select pickup mix with a foot controller rather than a mix or blending knob on the bass itself. This system is already 95% constructed.... http://www.talkbass.com/forum/f36/experimental-fully-modular-bass-rig-902681/ Once I get the filters worked out, that system will be reduced in size and housed in two rack adaptors and placed in a rack for bass use rather than the oversized cabs I've constructed (see thread linked above). But I'm ready to begin testing now. I plan on using EMG systems throughout for their ease of connection and high number of optional things they offer to fit in their connection system. Thanks.