When you own an older "classic plastic" sailboat you quickly realize that much of the above mentioned equipment has been changed over the years. Electronic equipment is the most obvious victim of constant change. Not many 30 yo boats will have the original VHF, depth finder, autopilot etc fitted. Radio Direction Finders have gone the way of the Dodo, thank God, I always hated them. The original electrical fit will probably have survived, but it will have received many "upgrades" in the form of additional wires piggy backed on to existing switches, new inverters etc. Mechanical water pumps will have been replaced numerous times and the manufacturer will have made sure that the securing holes are never in the same place. Water Heaters will have been added, refrigeration may have been replaced.
Many of these replacements will have been undertaken by a marine technician who has three overriding principles;
1. Mount the item where it is convenient to him/her, based on their arm reach, ability to work inverted etc.
2. Ignore anything below/under the new item which may have to be changed out in the immediate future.
3. Never, under penalty of flogging, remove the wiring/piping from the old item which is now redundant.
As TIH is in effect an "empty" boat none of the above rules apply to me. My preference is to mount everything on the saloon table, where I can work on it sitting on the settee. That's probably not going to happen.
My second choice is to give everything as much open space as possible and where I can access it for repair/replacement. Keep as much electrical stuff out of the bilge as possible (except for batteries). Keep as much electronic stuff (inverters etc.) out of the Engine Room. And try and get it all done before my wife realizes what I'm up to (Ocean Dove's comment about closets is correct).
Watch this space....