This skeletal looking Born To Rock bass is an odd one. The body is made of aluminium tubing, whilst the neck is wood but fronted with an aluminium fretboard. This was made circa 1995 and I'm guessing it's quite rare as you don't see these too often. Actually, I've never seen one before. I wonder if it was a production instrument or just a one-off? It does have a home-made quality to it. The bar connecting the end of the neck to the body puts me in mind of Roland's 707 synth controller. Apparently the idea is to eliminate deadspots.
UPDATE: BigRedX has pointed me in the direction of borntorock.com. One of the most interesting features of these guitars and basses is unique system they use to replace the traditionally used trussrod. To quote the website, "Suspending the neck on pivots allows the strings to position the neck. A string under tension defines a straight line. Since the strings are straight, so is the neck."
It's interesting to note that in the Care and Maintenance section the following method of string changing is recommended: "Lay the guitar flat on a table. Remove the strings and clean the neck with a paper towel. Don't use abrasive cleaners. Make sure not to pull on the neck when the strings are off, because it is attached only by the pickup wires. Restring in the following order, for greatest convenience: 6,1,5,2,4,3."