Is there a "best practice" for crossover layout?

I have finally got the parts for my l250 to 250Ti biased crossovers
These are going to be external and my thought is to hook them to the cab via speak-on connectors. My other thought is to make them quad amp-able is that a word?

My other wish is to remove the bus bars and use switches but this may prove to be more difficult than meets the eye. I have looked for rotary 3pole 2 layer non-shorting switches but current ratings for these are in the <1 amp range. Also the switch may prove to degragate the sound so just throwing that out there.

Also on the 48 uf caps I was only able to get 50uf this makes a difference of 1uf in midbass section. Will this be a big problem? IIRC there was some kind of "hole" if you will in the origanal L250 midbass section on overall sound. I hope this will not agravate the situation.:dont-know

I am using Daton polypros 5% but after measuring these (staticly) they are all within .01%

Any help with this build will be greatly appreciated!!