+1 on the Big Buddy heater!
And he's right....heavy plastic...cheap tarps...old stage curtains....block the wind,and you'll be amazed what a small heater will do.....
And to answer the Man Cave question: just doing improvements,before cold weather hits here.
Face & arms feel like they've been sand-blasted.....itchulation is a sumbitch.
And the 'rack system' is just for some leftover equipment I collected when I was stagerigging...has been stored away.And I'll be quick to add: the setup for my Handloading Emporium is not as elaborate as our outdoor system....
As a f'r instance: our deck has more square footage than our house....7 or 8 months outta the year,we spend most of our free-time,outdoors.
I had enough leftover equipment to set up 2 separate 6-channel soundstages,one at either end of the wrap-mostly-around-the- house deck.
10 of the surround speakers are the largest outdoor Yamaha version.Correction: two are Infinity's.
Each 12" Peavey sub is housed in a 64# industrial flue liner,made of fire clay.
Since they're down-firing, it produces a bass you can feel as much as hear,and never muddy sound.
All runs thru an old 16-band Kenwood EQ,modified by David

Page (was Waylon's guitar tech).
A 6 disc Yamaha Studio CD deck....bone stock.Isolated from vibration from the subs by a 16" bicycle inner tube,under a 18" square of ceramic tile.
The head units are Sony,hopped up with mostly Crown guts.
Won't bore you with more details,except it produces 125 RMS watts/channel X 12 channels total. Basically: at an idle.
Each level of the rack has a 4" muffin fan for cooling,and is lit with those little under-cabinet mothers that are a PAIN to install; the bottom rack holds a mini electric heater for winter.
Glad all my neighbors,including the Judge,likes my music.And they're quite some distance away....
All of this wild assortment is housed in a homemade rack,built inside one of those ?Suncast? outdoor storage cabinets....centrally located,and on the portion of the deck that's roofed.
If I pigtail into the computer,it can conceivably play just over 984 hours,without a repeat.
Since she still watches television,I added a 20" AKAI in the top rack.And a Sony DVD player.
Ya wanta hear some Floyd?