It’s an even bigger pain to remove the AMS from the top of mine 'coz I have a shelf immediately overhead, and nowhere to even temporarily relocate the AMS without unplugging it.
But I had no difficulty installing the 40W laser module and its cabling and hose using only the front door access. OK, it was a LITTLE more difficult than if I could’ve reached in from the top, but certainly much LESS difficult when adding the AMS and top removal and reassembly.