My temporary grow cupboard

Hi, just thought I would share my grow with you. I put these into 12/12 a couple of weeks ago but there was light leak on door THEN the timer failed so were on 24hr light for 2 days really only been on 12/12 a week. Was trying to train them but all is a bit mad and not got a lot of room. Oh you might see the 2 DIY NFT's I made out of gutter, hose and a small nft pump (now have one 205 nft with both pumps) this looks to be a rather good DIY job and then I put my 9 cuttings (first attempt)

Please advise anything I can do to get the most out of them as REALLY need a good yield.

here are the pics, you can see my diy cutter nft.

No one any coments or ideas on how to improve? I was thinking of putting a heat mat under my nft to heat it, do you think it would work?

wow thanks guys, so glad there are so many like minded folk out there willing to help.....

Do you use the nets to keep the plants from Growing or just touching the lights ?
Wont that restrict the light the center branches get ?
I am totally new and just curious