After seeing Ped's Wingbass at a bass bash last year which I really liked, Bastav's Wingnut and Jebroad's 20" scale bass I'm thinking of building something very short scale too. I work away a lot for work and it would be nice to have something to play in the evening when I'm stopping at hotels but it would need to take up only a little space in the car boot.
I've got one of the cheapy headless bridges in my box of stuff and a spare MM style pickup so I've made the following scribble. The bass would be 23" scale so that should be good for BEAD tuning or EADG using the bottom 4 strings of a 5 string set. No idea about woods or finish yet, this is just an idea at the moment.