Excellent job Warren and some nice pictures to boot.
Since you used the existing uBITX components, would your suggested next step be to provide a new LPF only board with relays or a manual switch ? ....to be mounted on the uBITX board ?
On one of my earlier manually switched LPF designs, realizing that not just any DPDT switch would work, I ordered some "bandswitch rotary switches .....6 position x2 " from Mouser. They worked quite well.
Which of the 4 filters are used for each band ?
73 Kees K5BCQ