I'm seeking some advice on using custom foam companies to get some trays for my models and find the dimensions and lingo a bit confusing.

I have several GW cases with the basic slots. They're fine for most 40k and fantasy infantry models, but irksome for anything else. I have some block trays for vehicles, so they are covered too.

Really I need some advice on the correct trays to fit a regular GW case AND fit the following types of model:

Chaos Knights
Smaller cavalry - High Elf Reavers, Chaos Marauders
Ogre/Ogryn sized models.
Terminators


If anyone with experience of custom trays could lend me some advice, I'd much appreciate the insight!