The branch lines of East Anglia in the 1950s offer some great modelling opportunities and the J69 fills the biggest gap in the RTR line up for this region. A couple of J69s, a couple of J15s, 2-3 Gresley and/or Thompson non vestibule coaches and some goods vehicles. A grounded coach body for a station building or some laser cut kits from the likes of Intentio or Laser cut model railways.
Plenty of opportunities for a junction station and backwater branch line as well. I really like the idea of Brittania's, B1s and B17s rushing by while a J69 or J15 trundles along with a branch line train like this one on the Brightlingsea branch.