re: Adjustable Router frame/Jig

Cool RC... however, I would be concerned about the strength of those timber tracks...

especially when you have the option of over tightening with a spanner (though pulling against a supported wood surface give some grace)... wood against wood may provide enough friction to get away with appliable pressure using knurled knobs (if you can find them)... well, that was my theory when I opted for aluminium t-tracks.
Your "mooning" is a neat touch.

Great to see the MFT style in use...

which as an outsider has just set me off brain storming... the high profile of those hold down clamps can be obtrusive when using a full faced router loaded with a following template (may bluff with a smaller trimmer and/or flush bearings if possible) and have always concerned me in the past... while they may be carefully placed not to obstruct the router/trimmer, those high shafts can rip the hairs out of the armpits.... got me thinking and immediately off to the workshop.... back about 25 minutes later with a few happy snaps... using an existing ji,g whose hole patterns could be imitated in this type of setup.  Something like one of these 3 options I quickly came up with,

The one on the left could still jeapardise the router (but save the 'pits) and would be a bugga to screw the top arm down, the one on the right would still be a bugga screwing down through the hole, if not attached on the bench edge, however, the middle seems the Goldilocks. 
Top view... that insert if 8mm threaded and only needs a few thread screws to attach,

and the bottom view which can be quickly tightened by a pre-positioned knurled nut,

Looks like a job for my UJK Parf system...

Yellow circles simulate 96mm spacings...