What's your plan for the top of your cube? If you're going with a hood that's going to cover everything anyway, I might give consideration to stock aluminum as a heat sink. However that would entail either drilling and tapping or gluing the LED's directly to it. In my mind (and my tendency to never leave well enough alone) these methods are less than desirable. I like the fact that I'll never have to purchase another heatsink again. I'll just continue to re-purpose these and change the LED's as technology and knowledge of these light fixtures develops.
If your plan is an open top with the fixture visible, these heatsinks are totally finished. It does take a bit of planning and imagination to make the wires going in and out clean, but certainly doable. I ended up drilling the heatsink and putting grommets and following the hangar I built.
My plan for my final fixture will be inside a hood mounted on moveable rails built from pocket door tack and rollers.
All my LED's have come from Milad. On my last order I was less than impressed with the packaging and shipping, but the product was good and the customer service was there to deal with my complaints.
If you're even thinking of multi chip, talk to Mike (mike31154). Nice guy and he knows tons of stuff about them. I was leaning that way after talking with him but I ended up chickening out, favouring what I knew.
My first fixture I used Inventronics drivers with the dim4 board and it was just ok. I didn't realize I wouldn't get dimming to zero and that sucked. All my lights go on 10% then ramp from there. It's amazing how bright 10% is. Might as well not even have dimming for the most part.
For my new build, I've got a wack of LDD 1000 and 700 Meanwwell drivers for the RB's, OCW's, TV's and a couple HLG's for my NW's. The OCW's and TV's are Exotic LED's and the rest are all 3W Cree's.
Ratio mix is much the eye of the beholder. I went with overkill and plan on adjusting by dimmer rather than try and get the correct mix by number of LED's. I live nowhere near anyone who runs a LED fixture so I can't really see anything in person to know what I'd call the mix I like. So, I have to figure it out on my own
Hope that helps somewhat. If you get to building something, start a build thread right away and keep us all posted.