Dean,
There is actually more room in the helm than you (and myself at first) probably think (thought). I am running the Latham Helm unit with Warlock rams. I started off with just the add on Warlock, then added the helm over the winter. I would highly stress to get everything done at once and do not settle for just an add on system. I know other people have had some luck, but my setup was down right dangerous at times.
One other thing to consider is dropping a few more bills on the twin engine pump setup. Not sure if you have two fluid pumps, but my port engine had a steering pump that wasn't doing anything at all. I decided to go ahead with the two pump manifold setup for a few hundred more dollars. The very first out of the year, I lost my starboard motor and had to putz 3 miles back to the marina on one motor. Without the two pump manifold setup, this would have been a little difficult. Without the hydraulic helm, however, this would have been
impossible!!! I figured the price of the manifold paid for itself after this outing. In fact, I had the
other motor quit on me a few weekends back (ignition wire feel off key switch). I drove for 5 miles at 30 mph on one motor and the steering felt just the same as it always did. Again, the system paid for itself.
As for the engine compartment, it is very tight. At the very least, you will most likely need to remove the risers on your exhaust (unless you have the HP's). After that, find a very tall and skinny kid to squeeze in there.
The only other option I can think of, is to have the boys lay up a new Innovator for you. MUCH more room in the engine compartment (hey Dave, I fully expect a 3% commission charge

)
-Bayley