to make it look lower at the front, swap the headlight bracket ears from side to side, turn them upside down and remount the headlight, it'll be about 6" lower and look way cooler, do the same with the handlebars and you'll be more stretched out and lower, makes the bike look even lower
chuck the instruments and either have none or fit little moped ones
chuck the mufffler and put a smaller one on or just don't bother, its only a 150, it can't be that loud
all stuff that can be done with a minimum of tools and experience
and thats quite a neat idea for the battery, well done
good luck, more photos as you go please
just a thought or two from an old time bodger