These parts form the basic structure and shape of the 737SS MIP. They are intended to mount to the full-size MIP Baseboard. They are designed to remove the complex cutouts from the MIP baseboard and replace them with standard rectangle cutouts where possible making DIY construction and assembly much more straightforward.
 
One notable feature of these base panels is that they are crafted from 3mm Grey acrylic, as opposed to the usual white material. Additionally, they are primed and painted with the appropriate 7011 paint scheme. This unique design choice is possible because these parts do not require any light to pass through them, resulting in a higher level of durability. Even if the panels are scratched over time, the dark grey colour acrylic underneath will be much less noticeable than if they were white.