Ther is a double door in front as back and two large opening on the sides I can use
I once saw a heavy cloth divider curtain (multiple layers) used in a tight attic eve space to separate a flowering area and veg area.
Plants never got to be taller than 2 feet and were trained to grow horizontally instead of vertically. Some light bleed did occur, mostly creating feminized seeds.
If you were able to drape, affix, seal, etc. a panda paper divider from floor to ceiling, you might be able to pull it off. Probably require some intense duct tape too, to seal any edges.
The obvious precaution, is watch out for light bleed, from your veg area into the sleeping flowering area.
Two tents would be easier, but dividing a tent, a box, or even an attic eve space can be done.
If you really want to get tricky, flower some auto flowers alongside the photo period plants you're vegging in a mini stadium that is the backbone of the divider wall you construct in the center of your tent.