This is the "look" you're going to end up with. I'd keep the engine as far forward, but under the seat, as possible. Watch the height of engine accessories. Then work out the details. I used a factory swingarm for the excellent brakes, dependability, access to replacement parts, and very good ride and handling qualities. That said, it does look a bit funky.
You could chop (mill) the swingarm, assuming chain drive, and weld butt plates to the front and sections and bolt them together to whatever length. The swingarm is probably not the strong item. Lots of flex. I'd build a cradle like a desert racer. Keep it simple. What about reverse? You can buy a reversible sprocket drive.
Rifter has the best overall setup, but the level of skill to build an independent system is way beyond most cart builders level. One if those things that "if you have to ask"....
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