The process(es) that led you here are not very different from my own. Originally, I just wanted something transportable that could be used on camping trips, especially for trails where I'd never take a car. I went through a number of intermediate stages...GoPed, DeBlasi, custom minibike. None of them really fit the bill. The GoPed was too small, slow, noisy, etc, the DeBlasi way underpowered & lightweight. Those two were dismissed out-of-hand before any cash could be (mis)spent. I was pretty well along with the custom mini build...13hp Honda/torque converter, front & rear brakes, front suspension, basically just had to fab a swingarm and figure out shocks. Then a neighbor & his wife went riding past on a clean K2 and it was all over.
Well, it was all over for anything else. When the CT70 first hit the market, it was pretty obvious that this was a real bike and that the lawnmower-type minibike had had it's historical moment in the sun. I recalled when the first "90cc" kits became available, circa 1972, back when a CT70 was a new machine and completely out of reach. I figured 50-ish top speed and 35-40mph usable road speed was good enough to get to the trails, more than enough on them. It all mushroomed from there and it's still a fun ride, in its own right.
My first rule of thumb is setting a goal. What do you want from the bike? IOW, speed, annual mileage, where it will be ridden, what kind of condition/aesthetics. From there, you work toward achieving those parameters. With research, thought, and some trial & error, it is more than possible to end up with a very successful and well-balanced bike. Let the insanity begin..:4: