ViewportFrame part Sizing

Hey,
I have a viewport frame. It should contain parts of different sizes from ~0.5 * 0.5studs and larger. It can also be that it is e.g. 0.5 * 5studs. I want the whole part or at least a little more than 2/3 of the part to be visible. Unfortunately my attempts so far have not worked, do you have any ideas?

What is not working? Have you successfully made any part of the part visible?