I have been looking for anything available on these as well before I start building one. I think I have looked through every "COMIC:" post type on here looking for any schematic info on the Mark II LG. If you find any additional reference besides the items gothic has posted, please let me know. If anyone else has any, please post. Thanks!
Planet Replicas' 1:1 replica Mark II LG (Note to anyone wanting to order one: the site states it is only available to be shipped within the UK due to customs restrictions) lists their replica dimensions as: 310mm x 120mm x 40mm
I am likely just going to scale from these dimensions if I don't find anything else. They have several large photos of the replica on their site as well.