We have this van & looked around for a while before deciding on a new van, a few things we did notice was if the A/C is internal you lose the bottom cupboard next to the fridge or under the front seat.
If it has a HWS these can be mounted either under the front seat or under the back bed, if it is mounted under the rear bed you lose the tunnel acces from out side under this bed which is quite a shame as it's a massive storage area, whereas the storage under the front seat is crappy IMO this is the better location for the HWS.
Fridges come in two sizes 90ltr or 150ltr
The microwave can be mounted in 3 different positions depending on options, 1. above the 90ltr fridge, 2.under the microwave if you have the internal A/C, same position if you have a roof mount A/C or 3. adjacent the door above the TV cabinet with the roof mount A/C.
Plus check out the My Jayco forum, there are a few of us who have shown off our 14.44-4's in there.