You might try to get plans from Dean's Marine at
http://www.hmbc.nl/merk/deans.html
They offer 1/96 scale Tribal and Kelly models. I've never worked with them but seen photos of completed models.
I've looked through several sources and haven't found much more than the side/top/front views that you probably already have. In "Warship Profile 2, HMS Cossack / Tribal Class Destroyer" by David Lyon, there are three interior views (scale drawings) of the mounting, again top and side. This is the best detail reference I have found, with labels. Again, no aft, looking forward views. It is available ror ~$20-30 at http://addall.com in their used book section
There are isometric/perspective diagrams of the 4.7 inch mounts in two books by Peter Hodges ("Tribal Class Destroyers" and "Destroyer Weapons of World War 2") along with some decent photos... but nothing to scale from. Martin Brice's book "The Tribals" has a decent shot of the canvas weather tarps installed, "DW of WW2" also has a shot of the canvas rolled up.