Thanks for the info on how the work is carried out.

Don't know what to suggest so far as the Han in carbonite hands...

Theres a shop not to far from me called Jedi robe

http://www.jedi-robe.com/star_wars_shop_london_uk.html

Don't know it may be worth a try... They may have contacts or prop hire infomation and this may lead you to the Hamd casts you need to get done.

It's a reputable business so they should help or perhaps point you in the right direction if they know where to find a Han in Carbonite full size replica prop.

I found one for hire on this site if it helps

http://www.theme-studio.co.uk/han-solo-carbonite.html