The actual DIY part is not my department, but I need to be able to nag and make certain I know more than my husband

....just kidding (about the nagging..lol). We are going to DIY the sump and refugium with acrylic, and I wondered if anyone has any tips. I've read through a very lengthy thread on acrylic at RC, but I wondered if you guys have mistakes you could share or ideas you came across that you wished you would have known about before.
Thanks!!