I think that it would be advantageous for case manufacturers if DSI would provide a 3D model for each product.
From past experience, cases which do not provide a void for the front-panel knobs / pots / encoders (e.g., SKB, RoadRunner Jetway, etc.) will negatively affect the lifespan of the product, particularly as force is applied to the knob shafts from the case padding.
IMHO the best cases I've seen have more rigid foam support down the top sides, typically angled, and allow the unit to be clamped into position without touching the knobs (Capro shown below). In some cases, the keyboard section will also have an additional rectangular block of foam across its span, which mostly keeps the unit in place.
Lastly–an elasticized keyboard cover really helps to keep any loose foam from ending up inside the keybed, especially if you plan on storing your unit for a period of time in its case.
As always, your mileage may vary