How would i go about building a go cart? I have some of the basics, no experience AT ALL.?

I have a 6.5hp horizontal shaft engine and a $150 budget. I have a picture of what i would like the final shape to be. (a reverse trike frame steering in the front rear wheel drive and if possible it be a 2 seater [300lb capacity]) any help would be great. If you think i need a bigger motor to have that capacity please say so.

That motor is fine. It won’t be a speed demon but it will move decently fast.