Its funny, when I finished it I realised that it wasn't tuned properly. It had the third string from the top (the thickest string) tuned down a fret. Which made it possible to do bar chords on it. Thats just how it was tune from the shop, and ive left it that way ever since. At the start I used a bic lighter as a slide to get that hawian sound, then I played bar chord blues with single note plucks for solo bits that really exploit the natural tone of the instrument. At the end the harp sound was more to do with the strumming and the fact that it has its two thinest strings on the outside.
I alays prefer to exploit the natural tone of an instrument. Thats why I wont put steel strings and a pickup on the uke, or humbuckers on a strat. Not that theres anything wrong with that.
More can be achieved by playing technique. I got three different sounds by just playing it three different ways. Heaps o fun.