You're doing an excellent job with it so far! I must admit I don't know too much about the Furness beyond the Pre-Grouping locomotive classes, but I am familiar with the shed allocations during the 1950s. There were Johnson 2Fs, Fowler 4Fs, Ivatt Class 2 and 4s and a LOT of Jintys!
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Our resident modeler Jupiter made a nice selection of lesser-known BR/LMS Locos allocated at 11B a shot while ago. They should be perfect for your Furness Route! GP Locomotives also did really good renditions of both the Stanier 4P Tank and the Stanier Black Five - two extremely numerous classes at Furness.