No. If you look at the thread carefully they are mostly pros and queries about "cons". There aren't any cons really - no cage is perfect and they all need some kind of tweaking. Don't worry about it, it's a great cage. You will need to mesh the lid though.
If you don't have enough plastikote to completely do the corners, it should be fine if you do them up to about 20cm - above that there won't be any substrate up against the corners or any pee above that
I would still put something else on the base, even if you've plastikoted it. Eg sheets of correx. Which is also wipe clean and easily replaced - adds another layer of protection.