If your design works, then there is no reason to change it. Mine was heavy has hell and bulky, making it really hard to deal with in the tent (I had some big idea about mounting the heatsinks to drawer slides so the footprint was adjustable...). The four 3000's were on Arctic 64's, which are kind of small, and I didn't do a great job of mounting them -- I drilled holes and then used self-tapping screws. Some didn't seat really well. The others are on Arctic 11 Plus heatsinks which are bigger and have a better fan design, and by the time I got to them I was better at mounting the COB holders, so I left those alone.
It was really nice to get properly pre-drilled and tapped heat sinks (from Northern Grow Lights), and basically effortlessly mount them. It's amazing how far things have come in a relatively short time in terms of making DIY lights much easier to do. It's a good thing I moved the ones I did, one was not fully seated and the thermal paste had sort of melted in the gap. It's amazing that one still works. They are tough little buggers.
This is going to be some haul ..............break out the stakes
