The framing idea is so the heat vent wouldn't be blocked by the dishwasher, this way I could just extend it out to have uninterrupted heat.

Our home can get quite cold so I want to make sure it gets full effectiveness.

Thanks for, I'll definitely keep that in mind. I can't imagine bracing it would be too difficult.

The surface area of the board for the feet does cover the entire length for the washer.

That's exactly what will be happening eventually, for the temporary framing it'll sit slightly higher but eventually will sit flush with some room to spare for some air space.

I'm purely looking for a temporary install since we have the dishwasher but this house was not built for one. Remodeling the kitchen will be done quite a bit later and we just want a functional solution to use it now.