What you want is here CLICK
you can see it in the Dehler 44.
And if you want my opinion, it is not that a good idea.
The flat surface is not that confortable. (looks better stowed away its true)..I was going to have them built like that, "a La Volvo racer", but after trying it, I foud that after a while you end up sliding one way or the other. The Volvos use flat boards, but due to their size, the boards are actually almost 3 feet long, and raise a lot more than the ones in the Dehler..really not that good.
I opted for rounded foot rests, that are removable with some fastners SD got me.
The advantage of the rounded is that as the boat heels, and you start to "ride up" on the footrests, your foot is allways at the right angle to your leg, which is not the case with the flat ones..believe me after 20 mintes standing it makes a damn differnce. The round are more ergonomic.
mine are very light and easy to remove..let me know if you need more help, ok?