Well that is a fulsome solution for the electrical connections, so fine for like-to-like bus KVM.
For ADB->USB there will still need to be a protocol-converter somewhere on the data path. For an A/B switch, where A = ADB and B = USB, you could probably fit a small circuit board inside the switch box. Not sure how much power you could draw from the bus power lines - probably enough for some programmable chips but not for others. Space should not be a problem, since the dimensions of those boxes is determined by the DB25 sockets and the (usually bulky) rotary switches, and includes a lot of air.
Rick
For ADB->USB there will still need to be a protocol-converter somewhere on the data path. For an A/B switch, where A = ADB and B = USB, you could probably fit a small circuit board inside the switch box. Not sure how much power you could draw from the bus power lines - probably enough for some programmable chips but not for others. Space should not be a problem, since the dimensions of those boxes is determined by the DB25 sockets and the (usually bulky) rotary switches, and includes a lot of air.
Rick