Hrrm unsure if Nozzles would realistically work, the thing outputs quite a bit too much of Exhaust to just go there from time to time and use a cell or so to just dump it in there.
The Engine was indeed supposed to be a Single-Block Combustion Engine like in older GTs. It would emit RU and be very useful due to its compactness and mobility.
And the Gas Turbine looks identical to the Steam Turbine Multiblock, so why you say its different. XD
It also has an internal ignition for now, though that might change.