Hi there, just jned here, I’ve been lurking this forum and te uk one too for the last few months while planning my builds. Lots of useful I for everywhere 
I scratch built a budget pack for last Halloween which was accurate up to the point of greeblies and tubes / lights , you can see the build pictures here http://www.theukghostbusters.co.uk/forum/viewtopic.php?f=4&t=1074
Right now I’m currently building one screen accurate pack and a ‘stunt pack’
Here’s the accurate pack build thread http://www.theukghostbusters.co.uk/forum/viewtopic.php?f=4&t=1085
And here’s the stunt pack thread http://www.theukghostbusters.co.uk/forum/viewtopic.php?f=4&t=1084
I’m currently looking for vacuum formed parts , particularly a bumper but I’d be interested in a full set of parts too for the right price.