Hello Annalee... I am so sorry to hear about your diagnosis. I posted a reply to you in the other thread before I read this one. I know how shocked you must be right now because I, and most everyone on this site, knows how hearing those words nearly knocks you to your knees... even more so at only 35 years old.
As I quickly found out, there isn't much information out there on bladder adenocarcinomas since they are in the "rare" category which makes this even scarier to deal with. I see you have already gotten a second opinion which is good. Did both doctors agree on the course of treatment for your surgery? It helps to have confidence in your doctor as you go through this so I hope you can get your concerns satisfied by discussing them with your surgeon. It's only natural to be scared and concerned, even with the best of doctors because when it's happening to YOU, it's impossible not to have those feelings.
The partial cystectomy has worked very well for me but I did not have to have any repair done other than just suturing up the tumor site at the dome where the wall was removed. What size is your tumor? Mine was relatively small (1.6 cm) but had invaded into the first half of the wall (T2a), so maybe the size is why some repair work has to be done in your case. Since colon tissue is used for urinary diversions, it must be compatible with the bladder and is why they propose to use it that way. I haven't heard of that, but in theory it makes sense.
You've obviously educated yourself on several aspects of bladder cancer and surgeries, and gotten a second opinion which is good. Some of those reports and statistics are pretty daunting, but treatments have improved since most of those were compiled. You are young and strong which will help in your post surgery recovery. We are all here for you.