900cc ninja golf cart/buggy build 140HP

Here’s the start to my 2003 Polaris “GEM” street legal buggy build, these come from the factory as electric front wheel drive street legal golf cart style cars. not many of these have been converted to gas . I’m lifting it up and pretty much making it into a truck buggy with a miniature truck box on the back to cover the engine area and rear end area. The engine will be a 900cc out of a 2003 ninja zx9r. It will have a gearbox with reverse and 4x4. I’m open to ideas from you guys to help cut some cost and make things easier. A lot of you have built some pretty badass machines and any help would be much appreciated. Thanks guys!