I am sorry I haven't responded earlier but I am just moving into retirement and have been getting my affairs in order. To answer your questions on both my router table and planner stand I drew up plans on both on Turbo Cad before I built them. I find it easier to draw up my projects before I build. its easier to change a drawing if something doesn't work out than to throw a bunch of wood away and start over. As for changing out tools on the planner cart that would be an easy modification as the top drops into the frame and rests on the MDF sides. instead of attaching the top you could pin it down through the frame. then just unpin, change out the tool re-pin and you are ready to go. The height of the stand was just a common height that works for me. I have adjustable roller stands for in and out feed so height was not a concern. If I can be of any further help let me know. I will be able to respond a lot faster now.
I have built many kitchens and finally decided to buy the Foreman, because my latest kitchen consisted of 28 cabinets and I was over my hand hurting from all the drilling, moving the clamp etc., it seemed like a smart choice.