I have no secrets, however the things you may be interested in,
I have a large section of scratchbuilt Spanish Pantile roof laying on my desk, A hacked about diecast bus geting a front end scratchbuild added, a Breda turret that just needs a barrel added and a Ferrol armoured truck that needs riveting!!!!
I did have a 28mm PBR Mk2 laying around somewhere too