This is for a pair of Class 47 cutaway headstocks in brass, with the rest of the parts (plastic) coming from the donor locomotive. Also suited to class 47/0, 47/2, 47/3, 47/4, 47/7, 47/8 (especially through the 1990's) and class 57. This brass kit builds up in 6 layers. (Main photo). From the top to the bottom.  
Top, 1st - Backer with heljan coupling cut out and screw tabs.
2nd - Main strength layer. Needs folding.
3rd - Main detail layer. With oval blanks beneath.
4th - Front detail layer
5th - buffer plate spacer.
6th - buffer base plate front.