Hi Brian
I can confirm that you do have to take the engine out to get the cylinder head off on the 1100R’s and you have to take the sump and oil pan etc off to get the engine out so don’t refit it until the engine is back in. The 900’s had a removeable frame side tube so you didn’t have to do this but the 1100Rs did away with that for chassis stiffness.
Putting the engine in is definately a 2 man (person if I want to be PC which I don’t) job and putting tape etc on the frame will prevent paint damage
good luck
Simon