Not much left to do. I was going to make the output circuit on a piece of veroboard but the all process is very tedious. I decided to go with a PCB as I feel that the circuit could be handy for other aplication VGA or PAL. Besides considering the price of 10x10cm pcb (5 dollars), the answer is obvious.

this board will contain the output color circuit which transforms the 1V signals into the proper 700mV signals needed by the VGA color standard (it seems fine with 1V thought, but the documentation mentions "peak" so I'll play on the safe side). This part will be able to invert the signal as well.

the board also has the envelope follower with three filters options (full bandwith, low pass, high pass). 

here a simulation of the front panel . The project will be housed in an used metal tool box.