Quick update!
I've finally rewired the light, now all the MH ballasts are external and can be control independently. The T5s are rewired so that I can control the front and back bank, also independently. The OEM fans are very noisy, so I replaced those with 12V PC quite fans.
Before light mods:
After...
Light and stand.
Bracing for the top shelve... peace of mind!
Enjoy!
Khoi