Thanks guys, and apologies for not responding, I didn't notice the comments had continued on the second page!
Mechagrunt wrote: I think though, the Port Autocannon has a slight droop. Maybe bring Myra around to sort that out?
Lol.
I looked at the work of DakkaDakka user "Veteran Sergeant" and studied a way to do "truescale" from him, here is a picture linked from his thread:
Essentially you saw off the legs from the groin piece of your marine, and cut small round or square pieces of plasticard ( I use 1mm thick but you can find what is best for you ) inbetween. You also insert a piece between the groin and the chest piece - in the waist so to speak.
Then, file the plasticard so it's smooth and even with your legs, add some greenstuff to some of the gaps you most likely have and file that smooth aswell. Voila, you're done.
You can use the vaurious apparel bitz like satchels and pistol holsters to cover up possible errors/take a shortcut if you don't feel like filing and sanding until the end of time and space.