Hi @davi-id - I’ve been playing around with this in between work (Which has admittedly been busy hence the delay…) but I’ve managed to get the first part done for you using one method. This is not a Catenary yet, but rather a set of Delauny triangles between your poles.
The next step would be to take these surfaces as inputs and create the catenary surface from them 
Dav-id_DrapedNetOverBuilding_Delauny_Catenary.dyn (308.9 KB)
You can take some inspiration from Catenary - #23 by paulS2UM4 where @Vikram_Subbaiah shows some pretty awesome DesignScript off 