Your designs look very professional, but also probably a bit 'over-thought'. It's just a sled, it has to be fairly accurate, but you don't need a micrometer for woodworking. I would advise spending the time on the projects/finished goods and not the tools/jigs - they're just junk to get you where you want to go.
Also, you'll find there's no such thing as a 'do it all' sled. I have 2 or three sleds, and they're all set up mostly for cutting small stuff. I'd need another sled for cutting larger panels.
I always advise people to let the projects dictate the tools. Proceed with your project, and when you hit a snag where you can't make something, then figure out what you'll need to make the part.
The project will dictate the type of sled you'll need. Different projects need different sleds/jigs/setups.