>>5296366Your 4504 is actually pretty close in size to the other two. Likewise, it's puny compared to proper minifig scale (which is why you can't get the landing gear to look right).
When it comes to actually starting to build the thing, you should just grab your bricks and go. Whether it's with LDD or with a pile of rainbow parts, just start tiling up your baseplates and building up those walls. Keep at it until you're satisfied (or show us until we're satisfied). You won't get the scale right with numbers or by referencing other MOCs, so just go with what feels right compared to your references.
