Even though the Revo 13 is my favorite of all the Hobie mirage line, I think Jcanracer has a point, though the revo is a nimble fast racing machine (how many other kayaks bank on the turns ( LOL), a standup able boat for us older fellows it is not. Probably even with sidekicks and a cane stuck in the mast holder pocket, though I haven't tried it, I have a feeling I would get wet anyway.
I don't mean to hijack the thread, but for what it's worth, my theory was sound but suffered in the execution. I succeeded in configuring my Revo for stand-up fishing by making and installing a stand-up rail using aluminum tubing and Bimini fittings, made an elevated seat which fits in the seat well and added sidekicks fore and aft. While I was able to stand up, I have to conclude that it isn't practical for me; a young guy could probably manage. I never felt that the boat would capsize, but it is pretty "twitchy" and I thought I was going out a few times. The biggest problem is that the footwell is too narrow to allow a wider stance for more stability- you can't put your foot out to counter the weight shift. The elevated seat worked out OK; with the sidekicks, it wasn't as twitchy as standing and was fine using trolling motor power... paddling would be a problem.
Hopefully, I have added something to the vast amount of knowledge and experience which is evident in these Hobie forums; it is inspiring...