I cant comment on your equipment questions because I dont know whats available to you in your country. I will make one suggestion. Be very careful when drilling into acrylic, it cracks easily and chips when you bring a drill within a yard of it. I would strongly suggest purchasing a bit designed specifically for acrylic, it will help. You should cover the area you are drilling with paper masking tape to prevent cracking.
I drilled the collection cup on my large skimmer and siliconed in a threaded elbow with a John Guest quick connect fitting on the end. I used a threaded connector so that the threads could flex in the hole and provide friction to improve the bond. I use 1/4" icemaker (RODI
) tubing as a drain line. The hose drains into a salt pail with a screw on and a 1/4' hole drilled into the top. Because the fit is so tight, no smell leaves the bucket.
It takes longer than you might expect to clog the hose, but when it does, I just connect it to my sink using a hose bib attachment
and rinse fresh water through it.