I'm up to about 29kW and about to double. I guess there just aren't a whole bunch of us out there going as big as possible.

Yes you can get risers cheaper, but I buy from someone who tests them and I'm guaranteed a working lot, and it ships in a week. I've bought cheap ones and had 2 of 10 that were soldered bad. I don't have time to plan and coordinate my orders and shipments further than a week. I also don't have time to wait on parts, so 15 is what I pay.

And yeah I do have a cleaning schedule, I clean one rig twice a week.

It's the heat that gets recirculated that causes me issues. If everything was sealed it would control heat much better.

When it reaches 100F here I run into gpu throttling issues and I have to check cards one by one until I find the one who's settings have defaulted.. It's tedious and it's difficult to see when a worker drops only 10 to 15 hashes. The other day I noticed one rig was running at 120 instead of 144 because two cards were throttled and i hadn't caught it in weeks.

I'm working on a prototype, my mock up is a newegg box and an msi lightning. I'll share pics soon.