I just received QMX kit so I took T30-6 and did a very quick test of the LPF. My order for the proper components did not arrive yet, so I just used some cheap 1608 ceramic chips. I only had those in E6 so I had to combine values to approximate my design... so components have errors. I just built it quick, didn't tweak anything, and I left the leads long so that I can actually use them as-is.
The filter deviated from theoretical prediction mostly in the passband ripples and the stopband ripples, but no huge major change in the overall characteristics. That's as expected.
The filter looks a bit aggressive into the 10m (I only do CW so I didn't care about slight loss beyond the CW subband) but at the same time I got pretty decent attenuation at 36MHz, so I might relax the cutoff frequency a bit upward, depending on how the actual emission looks like.
So, I think 60m to 10m implementation of QMX is one step closer.
Ryuji Suzuki AB1WX