ScrOG in this setup???

Hello to all the growers!
I`m curently in the middle of my 1st indoor grow, started from badseeds.
Plants are about 10 days from flowering.
The grow has been going great, except some nute burns after the 1st feeding.
I figured that since the grow closet setup was already built I should go ahead and get some good seeds.
Ordered from BC Seed King, got my beans in 10 days (East Coast).
20 BC Big Bug seeds.
Put 6 of them in jiffy pellets last saturday.
The all sprouted yesterday!
Now here`s what I was thinking: Once I get a strong mother, I should split the grow closet in 2, bottom for veg with CFLs, top for flowering with HPS and ScrOG.
Here`s my question ; Would this setup be a valid grow operation for a 20"w x 20"d x 72"h?
Here are a couple pics of the setup during veg with the Sun System 150w HPS with some CFLs side support.

I'm nearing the end of my first indoor grow with similar conditions so ill add my 2 cents. if you half your closet your gonna have something like 36" total height each cab. that is WAY too small for flower room using a HPS light unless you also own the worlds smallest stand alone A/C. Im flowering some clones in a separate box roughly the size your aspiring to grow in. Im using 100w of CFL and temps are getting as high as 100f inside there!!! (outdoor temps are cold) i have exhaust and intake fans too! the problem with such small spaces is heat, and unless your gonna cut that cabinet open to install some duct work so that heat isn't lingering inside i wouldn't recommend going that small. reason being heat stress, you will be battling twisted growth in veg and have a nice harvest of useless Hermie seeds.

However that dosnt mean you cant do a perpetual grow. i would maybe split it 30/70 and throw a humidity dome and single t5 in the bottom section to make a clone room... I think that trying to fit a mother plant and fully budded mature plants in that same cab is just too much for that space. i think that you should just get another small box and make a mother room. as for SCroG i would recommend it, optimizes lighting to the budsites. Even a verticle scrog might work for you because u dont have a lot of horizontal space. i dunno just some things to look into

The plan was 70% flowering with the 150w HPS and 30% vegging with CFLs (number and wattage to be determined).
That would give roughly 50" for flowering and 22" for veg.
That being said...I started with a couple CFLs and kept adding lights untill I got to the 150w HPS...temp hasnt been a problem so far...have plenty of air circulation, good intake fans and if need be I have one more I can hook up for a 2nd exhaust.
The question was more about the area I would grow the ScrOG in...is 20" by 20" a manageable area for ScrOG?

20x20 will work what makes it manageable or not is how large / small u make the screen holes. little holes give u more control over placement... but getting budded plants out of say, a chicken wire scrog would probably be more challenging.