I made them for, family and friends and I take commissions some times yes 

Depending of the time of builds it can take 1 week or 1 month easely^^

A simple conversion like that will be quite fast:

But a full custom like this one take longer actually several month in this case:

And for battle damaged with reveal crystal chamber like this three is also quite long to make:

Plenty of video here: https://www.youtube.com/channel/UC5wq9GUzzjlWHLKTXdnv1Sw/videos