"The Gilded Coin" is OK, but I was thinking about maybe making the name deterministic instead. Build a statue and stick it on a wall between a couple doors on either side of it into the main entrance to the "hospitality complex". Whatever that statue is, becomes the sign of the place and it's name. I figure there should be an "entrance hall" with an "exercise room" (training area) just off to one side where Baffler and any other security staff (as well as patrons with a mind to do so), can train up their various martial skills while on guard duty.
The "entrance hall" would then lead into the common room and Tavern proper, with the brewery and kitchen behind those and to one side, while the guest rooms are up a level and to the other side (so no-one's sleep is disturbed by the common room's revelries.
Getting a service tunnel into Highmax's forge area should be no problem, so long as it passes through a furniture or goods stockpile room first. It's only logical that any craftsdwarves and other suppliers come in through service entrances. (And have their own rooms away from the guest quarters.)
The low/no cost dorm could be a youth hostel area on the other side of the exercise room. Of course, any of the hospitality staff would get their own rooms assigned to them next to the kitchens, hospital or gardens, depending on what capacity they were hired for. The hospital area should be situated 1 z-level above the hostel, so that the cistern can be situated 1 z-level below the hostel, giving both a source of clean water via wells placed one above the other. The private dining halls would let off of the common room behind the kitchens/breweries, while the storage areas, employees living quarters, storage rooms and Highmax's Access Tunnel/s would be under the kitchens and breweries. I'd suggest a secondary well and cistern not directly connected with the Hostel/Hospital one to be situated directly after the common area, (the Bath-house I spoke of before), that then opens up into passages leading to the various private party rooms dedicated to the various deities, (and possibly down to the viewing galleries of Highmax's Arena), so that patrons using this will not have to be disgusted by the filth from the newly arrived vagabonds, nor the hospital nastiness from cleaning patients' wounds.
instead of a maintenance hatch, just sweep the floor with a rush of water from time to time - some wall grates a tile or two downstream from the flood hatches should catch any goblinite for later retrieval by hauler gangs.
The same method could be used to quickly clear the arena after any survivors have been recaptured or put out of their misery.