Tewilso,
I am familiar with the Beneteau 331, 343, & 393 layouts because I chartered these boats in a charter club, for a few years, before buying my 343. I am not familiar with the 323 layout, so take my advice accordingly. Also, I had the advantage of observing & using the factory windlass installation on the 343 charter boat, so I simply replicated the factory layout. With regards to the V berth access, there is a wood panel in the cabin forepeak area that is secured with self taping screws. Once the panel is removed, a space is exposed that will accommodate the motor & solenoid for the vertical windlass. Beneteau was so kind as to scribe marks into the recessed area of the deck mold where the external components protrude thru the deck; this simplified placement & cut out of the hole. LIFe batteries were not a consideration 12 years ago & I duplicated factory installation by wiring into my existing house & start bank of 400 amps. My batteries & switches are located in the port side aft berth, so that’s the route that I started from (thru a dedicated 90 amp windlass fuse supplied with the Lewmar kit). The 1”O” or 2 “O” tinned cables traversed under a hanging closet, behind the galley stove, thru the port side settee (where one of two water tanks are located), thru the forward bulkhead, up thru a hanging closet in the V berth, along the concealed interface of deck & molded headliner, & finally to the recessed space behind the panel in the forepeak. The red & black cables (approximately 30’ each) & connectors were purchased from online supplier, Greg’s Marine Wire. Again, I am not familiar with the 323 anchor locker configuration. You can see my deck configuration in photos posted in this thread. There are also photos that show a horizontal windlass installation on a 323; you may be limited to a horizontal windlass for your application. I am certain that the 331 had deck / anchor locker configuration for a vertical windlass. Hope this info helps.