The operating theatre is always a good source of income, fortunately it was possible to grab two surgeons early on. The doctors are all good or excellent, helping to keep things ticking over nicely. Notice how the staff room and research are out of the way. Most tired staff can be picked up and dropped in the staff room. No training yet, finances are too tight.
Research is heavily biased towards increasing the efficiency of the drugs in the pharmacy.
New cure rooms are also researched heavily, as they will bring in most of the cash. Diagnosis rooms research proceeds more slowly as they will play a more important part later on in the level. Heating has been increased slightly so that fewer radiators need to be placed. As the hospital grows then many of these rooms are going to be moved further out. This design balances the limited cash with the need to provide services, so it is cramped.