Here's the setup I plan to use.
Yeah, I've also designed and build a setup for corn in no time, based on
ebb and flow system (as seen @ youtube but with double bed and extra stand). It is actually build from parts I've used earlier with other setups - even the reservoir (180 Liter) is a used-one.
The upper "beds" will be filled with 3 different media, first (bottom to top) basalt gravel (very cheap here), pea sized river gravel followed by a bit finer gravel. This concept assures best drain downwards but enough moisture for seedlings small roots at the top. A very small and economic
pump will do the job of fow/ebb cycles. 400L/h and only 5.5 Watt is already tested to be sufficiently powerful.
I didn't specify any dimensions here, as the design is- and should be -put together with existing parts. The frame (stand for the bed reservoirs) should be adapted to reservoir and other sizes.
For any questions or more techs and specs, do not hesitate to ask!