Thanks

Advices to those who will have one of them:
1/ Wash them to remove any Petroleum jelly used for casting. Otherwhise it will be like painting over oil...
2/ Paint before assembly, that's easier.
3/ Use a small amount of green and glue for assembly; green will allow you to adjust the base and top part so that they are perfectly horizontal. Just be careful not to use too much green stuff; you only need a bit.