It’s been 20 years since I specced one of these! My one bit of advice is to seriously consider a slide out (like this https://www.middleatlantic.com/products/racks-enclosures/slide-out-racks/asr-hd-series-heavy-duty-sl...) if you are building in wall. Having access to the rear is invaluable without having to take everything apart.
As to fans and cooling you can always add rack mount fans if needed, do make sure the wall space is ventilated however.
As you are also presumably doing in wall wiring I assume you have a specialist AV installer working this all with you, they should be able to help you design and build just what you need
As to fans and cooling you can always add rack mount fans if needed, do make sure the wall space is ventilated however.
As you are also presumably doing in wall wiring I assume you have a specialist AV installer working this all with you, they should be able to help you design and build just what you need