This post came up while I was researching the same thing. Probably too late for you now, but might be useful for someone else.
For the MFT3 the holes are 20.15mm diameter, centred at 96mm. The top is 18mm thick.
The older MFT had slightly smaller holes, which I think are 20mm diameter - but the guy who makes the Qwas dogs would know for sure (
http://qwasproducts.com/Home.html )
The longer rail or profile on the MFT3 is part no 472863. It doesn't say how long it is on the Festool ekat page, but is around 1100 to 1150 mm long judging by the overall table dimensions. Currently 41.04 UKP.