Finally have an update. Weather has been crappy and cold last few months, and since I do most of the work in the garage, it was cold. That prevented me from doing much. I finished light mount, or at least have it 99% done.
As can be seen above, I made a frame using square aluminum tubing and didnt lineup some of the corners perfectly. I used Blue Demon Triple Play Low Temp Aluminum-Zinc Brazing Rod and MAP gas to fill in the gaps that can be seen above, and to braze legs to the whole structure.
Since I never did this before, there was a lot of reading and watching of youtube videos. Really important thing that absolutely has to be done to get this to creat proper hold is to make sure that aluminum tube is up to the temp. If it is not, and you melt the rod onto it, it will not stick at all, and will create for really weak connection. Few pieces I had to break off several times as I couldnt get one side to braze properly. Once I figured out how much I need to heat up the tube, it was really easy and fast work from there.
Once it was all done, I painted it black, mostly to cover imperfections in brazing as much as possible
As you can see, there are legs inside of legs. Unpainted legs are brazed to the frame, and then I created another set of legs and base that top frame goes into (all black part). This will allow me to move whole top frame up and down about 5 inches. I wanted to have option of moving it, so that when I start figuring out PAR and height I should place lights at, I can play around with height and see which one works the best. I just have to drill few holes to hold it at various heights. Finally, I plugged square tube ends at the bottom with plastic caps.
Also, light mounts (aluminum bars) where NP lights are mounted can be removed via screws, so if I decide to use different lights I would just have to space those bars around in new position. Then again i can play with height and re-adjust as necessary. I also made sure that I have enough space so that I can mount a single T5 fixture on each side, if/ when time comes for that