You do realise that you talking modern history here. As others have said Bill Hudsons book "Through Limestone Hills" ISBN 0 86093 217 6 is the definitive text with drawings of most of the station structures from Ambergate through to Chinley. It is however as rare as hen's teeth - but well worth a search on Abe Books (aka Amazon for wrinklies) or Oxfam ( who are getting a lot of good stuff as codgers such as myself are called to the scrap yard in the sky- they understand the value of the books being donated unlike many other charity shops and railway books can searched on their web site). Bibliophile Books is also worth a look.
Equally worth a look are books by John M Bentley published by Foxline and later Booklaw. Greg Fox in creating Foxline set a benchmark for others to follow in terms of content and price accessibility.
Look for J M Bentley Foxline Scenes from the Past 2 "The Railways around Buxton" ISBN 1 870119 01 0 published in 1987. He then went on to write Scenes from the Past 7"The Railway from Buxton to Bakewell.Matlock and Ambergate" and latterly following Booklaws adoption of Greg's Foxline books - Over the Peak Parts 1 & 2 ISBNs 978 1 907094 65 1 - ISBN 978 1 909625 00 6.
Keith Miles Foxline Book Scenes from the Past 44 "Rowsley Motive Power Depot" is also worth a look - Foxline ISBN 1 870119 72 X
With regards to architecture Chinley is not a good example to follow in that the latter was completely rebuilt as part of the 1905 expansion including to Gowholes to Heaton Mersey cut-off. Chinley was rebuilt from pre-fabricated timber kits. Millers Dale was rebuilt at the same time but only the western platforms - the original station on stone, the bit you are modelling remained as seen in the pictures remained untouched. If you have a chance to visit the area - Bakewell Station Building is still extant and would probably fit better into the scale of things.
I have not seen Bill Hudson at his regular exhibition haunts for a while but his team still turn up. If only there was some publisher willing to republish "Through Limestone Hills" - if only