You can get a bit more space by omitting the floor plate. But you lose the comfy angle of the pedals and even when placed on the floor, I don't think that you can use the whole movement range on that simpeds in the obutto. The lower frame is simply too narrow for some flight sim pedals, after all it was designed primarily with the sim racer in mind.

I've seen some pics of the Saitek Combat Pedals used in an Obutto some while ago, I can't remmeber where though. Guy complained about the lack of space. Since the Simpeds are even wider, I assume the problem is even worse with them. Really a shame, since Simpeds are great.