I'm proud of you. Repurposed an older machine to work as you wanted. I was scared you were gonna say Kapex :-) From the grills on the side table looks like it may be an older Craftsman, or similar TS hiding under that sled. Certainly a Contractor style saw by the legs, so no zillion dollar saw needed. 

I like your sled. I like your mindset as well, make something to hold your parts where you want them, cut only a few angle shapes so you can better zoom in on dead nutz, and finally use some manner to creep up on "exact" All that is left then is careful measurement, and always look twice, cut once. At first it is likely a trial, after a fashion it's just the next piece. For the cuts I like the sled more as I look at it. If you can eliminate creep, which locked down is the best way I know of, you can make crisp cuts. No matter what, movement during the cut is bad juju.

Cool, any special sauce for your saw blade, brand, geometry of the teeth?