Question 1

Can you rehouse or add PL mount? I want to use them on a Alexa camera

Accepted Answer

No unfortunately not, apart from the Mamiya 645 lenses. I modify still lenses to ef mount and make them more usable for filming. There is EF mount for Alexa cameras so you can use these lenses on Alexa.
To buy a modified Set is a great way to test lenses and if you truly love them you can still rehouse them by a reputable rehousing company later on.

Question 2

Can I order parts to do the conversion myself?

Accepted Answer

I don't offer parts for the conversion unfortunately.
There is specialised online retailers :
www.followfocusgears.com
www.simmodlens.com
www.leitax.com

Question 3

What cases are you using?

Accepted Answer

The cases come from www.precisioncases.com.au

Question 4

I've got a lens that has got a mechanical issue can you fix that?

Accepted Answer

I don't repair customer lenses, I personally use a Leica trained Lens technician www.europeancameraservice.com