Thanks Guys,
@skimtb , we have purchased 4 High Bay 100W LED lights with 2ea on a separate switch, as these will hang from the 2 roof beams. Not sure if I will need more but will see what it looks like when up. Roof also has clear sections to let light in during the day. Also thought of using a Kayak winch to hang vests etc directly from the boat and hoist up when done.
As for stereo.. I have our old home cinema set up going in the man cave / bar, 55 inch TV screen, 1000w 5.1 amp, sub and Bose Cube speakers on the walls.
Have also arranged for some pallet racking to run along the wall next to the boat, so I can step out the boat onto the shelving, hang the skis on a rack, and hang the inflatables to dry.
Will be running power this weekend, and starting to line the walls with Plywood and insulation. Floor coating is on and drying.. Wallet is significantly lighter......