Need help. wanting to build a COB fixture for 2'x4'x6'

I have some leds(mars hydro or Sn300) in mind that i want to buy, but i want to see what it would cost to build cob fixture to cover that area. What cob 3070 or 3590 and what drivers to use? thanks.

Greetings:
I would suggest considering the following:
http://www.cutter.com.au/proddetail.php?prod=cut2900
Bracket can be made using angle aluminum and small nuts/bolts (Lowes/Homedepot)
All you need for veg to flower. Oh, dimmer switch(potentiometer) Radio Shack, good to have, though not needed.
Suggest viewing Growmau5 and Greengenes Youtubes to see the potential and possibilities.
I've assembled both Growmau5 X kit and Greenegenes 200 watt DIY. Greengenes 200 works well, but
uses a very heavy heatsink (active). I made 3 200's before the pin heatsinks(passive) were more readily available.
Would not advise the active heatsinks due to their weight alone in a tent.

Hope this helps.
Stay safe!!!
Success w/ya grow!!!

Here's a few pics of my 2x4. 6 3 gal smartpots, now in flowering, vegged in tent. Running 200 watts, single drip stake in each. 4 Kush n Cheese or BlueMoonRocks (forgot to label), 2 in middle are Blue Dream. Nutes from clone through flowering Jacks 321 schedule. 12/12 started 1.2.17. First run in the 2x4 and COBs. Fixture is 4 Cree CXB 3590.
Something to consider. Be encouraged.
Stay Safe!!!
Success w/ya grow!!!

FYI
I found this at LEDBuilder.org. Seems a nice option.
http://timbergrowlights.com/grow-light-kits/cree-cxb3590-kits/

Stay safe!!
Success w/ya grow!!!

4x CXB3590 CD bin 132USD
4x iceled 550 heatsinks 50USD
1x HLG-320H-2100A 86USD
+ a 12v power adaptor to run the fans on the heatsink

running these specs will get you 300w

I run:
2x CLU048 1818 90CRI (wired parallel)
2x 140x70mm passive pin heatsinks with fan aimed at them for additional cooling
1x HLG 185h-48A at 100%

This gives me 53 volts, 241 watts, and 3.9 amps to the cobs. And the cobs are only running at half power but still giving over 12000 lumens each