LavaSurfer:
Basics:
BackPlate AL or SS
Harness (Hog)
5 D-Rings
Crotch Strap (Padded with Velvet)
Pockets
Pretty much right. A hog harness starts with about 14 feet of 2 inch webbing. If you get this much you should have plenty left over for a weight belt. Reef Scuba has some good webbing...
http://www.reefscuba.com/ropewebbing.htm
The hardware includes 2 bent D-rings... one to go below each clavicle... and 1 regular D-ring for the left waist. The crotch strap usually has two D-rings, although the front D-ring isn't needed unless you are using a scooter, Scooter. If you get one already made up from Halcyon or Oxycheq, it will come with the front D-ring sewn in place with the back one held in place by a keeper.
In addition to this you will need 5 triglides... or keepers to lock the webbing in position on the plate and to hold the D-rings in place.
Also, you will need a nice SS waist buckle. Get a heavy duty one. Oxycheq and DSS have some nice ones. Don't use the cheap ones from Trident.
One more thing... a small cutting device and a sheath. These are usually 2 inch blunt tips. You can easily make your own by breaking off a steak knife. The sheath is a little harder to make... but your local shoe repair place can probably sew one together for you with some of your left over webbing. I think it's just easier getting one from DSS, EE, or Oxy.
Oh... there's more...
You'll need to order up some bungee... 3/16"... from the Reef. A small loop at the left chest D-ring will hold your inflator. Also you will need some to make your necklace.
And...don't forget the inner tube. You'll need some on several places on the harness.
Bolt snaps! Don't forget the SS bolt snaps! You'll need one for each backup light, one for the SPG, and one for your primary reg.
LavaSurfer:
Single tank config:
Wing with 18-30 lbs lift
STA
Cam bands
STAs generally come with cam bands... well, at least the ones I have purchased from EE always have. Plus... the Halcyon STAs/cam bands have very nice SS buckles.
You left out the reg setup! You might want a DSMB, too!
LavaSurfer:
Doubles config:
Wing with 30-50 lbs lift
Steal tank bands
Manifold w/isolation valve
Those Al 80s that you plan to use pair nicely with a 40# wing. They need 7.25" bands. Highland bands seem to be the gold standard. They come with different bolt sets, though. So, you want to make sure you get what you need. Generally, most plates use the 5/16" bolts... but if I remember right, the Halcyon plates need a particular set... 5/16" but a little shorter than most... I think. Some guys like to cut their own with some SS all-thread, but that's another hotly debated topic.
LavaSurfer:
Cave/cavern diving
Doubles Setup
2 first stage regs with 2 seconds minimum
Extra Mask
10 watt HID light
2 backup lights
2 spools 150 foot and 250 foot
That list looks mighty short!
Usually, guys talk to their instructor before getting gear. Here is one list from Fred Devos...
http://www.aquaexploration.com/English/Caves/Personalized Cave Training.htm