Hoping you guys could help with a loadout

Alright, I'm currently saving up for a Kokusai Crimebuster, for those of you who don't know what that is, it's a classic airsoft NBB, incredibly efficient and consistent setup. When Booster tunes them they are accurate out past 350' at 550 FPS (.2 chrono, .4 in operation) and reports have been made of out past 450'.
In the following loadout I have organized everything that I think I will need and have found the items I think best fit my needs. I know that this loadout is basically overkill, but I think the name speaks to my view on that. If you guys could just go over the practicality of this and shoot me down if I am wrong I would be much abliged.

On to the good stuff:

It is an HPA gun, so I'll be using a Crossfire tank:
http://www.crossfireinc.com/products.asp?cat=29

Reg system will be bought from Austinwolv on the classicairsoft forums, very reliable two reg system, might ask for a valved main reg to depressurize the system after use.
http://classicairsoft.org/forum/showthread.php?9002-WTS-Pre-assembled-dual-reg-gas-rigs

Grimlocs to hold lines to web gear:
http://www.tripleaughtdesign.com/Equipment/Clips/Grimloc-Carabiner

Two 90 degree panels to rotate tank pouch across lower back rather that directly up the back (lower profile): http://www.tacticaltailor.com/90degreepanel.aspx

Frag pouch to hold Secondary regulator: http://www.diamondbacktactical.com/product/Diamondback-Tacticalreg-Frag-Grenade-Pouch-Single,225,49.htm

Pouches to carry 3-4 mags:
http://www.octactical.com/ar20rndmag.html

PALS weapons catch (DBT if possible)

Pouches for two MP9 mags:
http://www.usgruntgear.com/hksubgunmodo.html

Throat Mic:
http://www.soundrite.biz/headset/nt3blkops2-description.html
(already have motorola Talkabouts for radio, need radio pouch)

The vest this will all be on:
http://www.grtgear.com/Products/GrandRiverTacticalVestSystems/LBV3/

This will all go over a ghillie (homemade over this summer) with jute/burlap tied into the molle and hairbands/rubber bands to tie in natural veg. This is where I am a little concerned. How do you guys think it will work running a vest over a ghillie, should I just ghillie up the arms and a little on the sides, leaving the middle open for the vest, or should I make a full crawl suit and just put the vest on over the jute?

The other thing is, if I'm going to sling the rifle at all, I will have to use a single point, as the forward sling mount isn't very strong. How will this work with transitioning to my planned secondary (KWA MP9R)? Should I plan on only using the MP9 when pinned down and unable to get out, in which case I wouldn't need a sling for the Crimebuster and the plan for engagement would be to drop the rifle, pull the MP9 off the weapons catch, and fire. If I got a single point sling, I could fire the MP9 while extracting, although that might not even work. What do you guys think?

Thanks for your help.
Sam