Note: this is not the correct place for questions related to remote controls - please post those to one of our many other forums!
so now to answer the question
1) paint on a latex coating
2) get box big enough for the mx-3000
3) fill box half way up with plaster
4) put in and embed a bit the 3000
5) fill rest of box with plaster
6) wait for plaster to dry
7) cut open the plaster
now you have a template for the building of MX-3000