To start I'm putting in 30 x Antminer S9's, that's about as much as the genset can handle. I've sized the container for a larger load however, and to accommodate a larger genset. So the max I'm thinking is about 72 x S9's, but only after I have this baby up and running and can be confident I won't have issues with condensation (which is my biggest worry honestly).
Is this an "infrastructure" mining unit (network, cabling, power) or is it a "mining" unit (miners included). What sort of final costs are you looking at? I have someone looking at making an infrastructure unit, his costs were looking at 2.5 ish BTC at current prices. Currently have access to a location with very, very cheap power and as NotFuzzyWarm said - rapid deployment and easy scaleability without much physical legwork (running cables, running network, setting up routers) is a critical value-add for this kind of project.
This unit will have a cellular modem, complete wiring and remote circuit control. I'm not planning on building these for sale, but if that was something someone was interested in then obviously we could work something out. The application is obviously not plug-and-play into grid power, as you can see I'm generating power off of natural gas. It is plug-and-play for natural gas.