I thought before I got started, I'd look into some information about the bird I'm going to do the trip in.

You can be the judge of how she looks in FSX, but overall I don't think Wilco have done a bad job at recreating her in the classic Union Flag livery of BA.
AIRCRAFT INFORMATION:
Boeing 737-436 G-DOCU
Airframe Details : Construction Number 25854, line number 2417
Engine information : 2 x CFM International CFM56-3C1, 23,500 lbs static thrust
Date of manufacture / First flight : 22/12/1992
British Airways delivery date : 18/01/1993
Passenger capacity
147 to 168
Range, miles (km)
2,370(3,810)
Maximum gross weight, lb (kg)
Takeoff
138,500(62,800)
150,000(68,040)
Typical operating empty weight, lb (kg)
76,180(34,550)
76,760(34,810)
Maximum fuel capacity, U.S. gal (L)
5,311(20,104)
6,295(23,828)
Lower-hold cargo volume, ft3 (m3)
1,373(38.9)
1,095(31.0)