you definitely have your stuff, but that is NOT enough room for vegging AND flowering, even with lst.
if i were you, id take off that bottom shelf, and use something else to veg in only because while vegging your plants have no choice but to stay smaller, rather then switching into flowering they double and almost triple in size. its also pointless to have an mh and an hps bulb unless your going to veg with that mh, but thats not possible with two seperate chambers obviously. im sure you know that during flowering they LOVE the 2700k spectrum.
also those temps will drop dramatically taking that ballast out of there, if your worried about people seeing it then just get some cheap thin ply wood and make a little box, mount the ballast on the outside and use wood glue (preferably gorrilla glue) and set it over the ballast, just make sure that the ballast is not completely sealed, and none of the wood is touching the actual BALLAST itself.
im absolutely positive that after you A) take that shelf out and allow more air flow throughout your environment, and B) get that ballast out of there, you wont have any worries with temps.
but then again thats just my honest oppinion
extremely thought out environment built with tender love and care, props ^_^. cant wait to see that thing in action bruhdda, good luck with your grow and i will definitely keep posted