Pelmets or hidden pelmets?

I've been doing just a bit of research about pelmets.  We want them for our curtains in the living areas (for the stacking doors) and will probably get them for the master bedroom, study and guest room too.  Not sure what is happening with the home theatre as I'm staying out of that one in making any decisions :)

The options currently are DIY pelmet (doesn't sound that hard tbh) or try and get a hidden pelmet installed like ezypelmet.

Ezypelmet looks great!  But not sure how we get this done without any contract variations.  Maybe it's just a matter of chatting to our site supervisor and getting this organised if we supply it?

Totally first world problems and something I wish I had thought of prior to getting contracts finalised...

Even when we come to curtains there will be a drama as I'll have to decide on centre opening (current thinking) or just one side opening where the curtains all go back against one side.  Ah well by the time we decide that it will at least be all locked up.  Fast forward please!!!