I am not much help in regards to the glass / acrylic question, but one thing did jump out at me ...
Whatever you do, don't rush the process. A tank needs several weeks to cycle even with the aid of ammonia. I have not lost a fish yet and used a fishless cycle on all 5 tanks. Please read the following links, they helped me a great deal while I was setting up. These forums also were a life saver!
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http://www.fishlore.com/NitrogenCycle.htm)
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2 Ammonia methods of cycling your fishless tank)
I tried some cycling products on the market for my first aquarium, and have been very successful cycling the other 4 aquariums WITHOUT the products ... the only thing that worked for me to shorten the process was using established media from another filter to "seed" the new aquarium (that comes with some risk of introducing disease into your new tank).
So ... what I am trying to say is, let it cycle naturally without fish or "cycling" products ... I did not try ammonia only because I could not find "pure" ammonia in this small city (Moncton, NB, Canada). It is tough to wait, however it would be even tougher to watch fish die and waste your hard earned money.
As for the Python ... I thought about purchasing one, but at the moment, I do not mind using 5 gallon buckets for partial water changes ... plus I like preparing my water in a separate bucket prior to introducing it to my aquariums. I also rinse my ornaments and filter media in the "dirty water bucket" (but not all at once, just one every second partial
water change). Personal preference I would say ....
I am not sure what you mean by an overflow ... my Gourami is doing great in my 55 gallon ... just give him/her floating plants so they can hide (I have a corner dedicated to him), but be sure that they have plenty of room to "come up for air". I only have 1/4 of my tanks covered with floating plants.
Well, my 3 year old just woke up from his nap ... quiet time is over .... I hope this helped a little and convinced you to take it slow ... rushing it will only lead to many frustrations.
Everyone is welcomed to correct me if you see any questionable advice ... I am fairly new to the hobby, but like to share what I have experienced so far.
Happy long weekend!
Moe