Sir,
I have checked the documents you provided and at first glance I noticed some common mistakes and optimization needed in your "Banking Transaction" diagram.
In short I know what I'm doing due to my good experience with UML projects and I can be very helpful for your task.
I don't want to misinform you or anything, if I'm capable to do it I am, if not I wouldn't even bother you and risk myself a bad review and wasting both our times.
All needed to mention is mentioned, at least I guess.
I'm very easy to talk to, even if you are not working with me and wanting some advice I will be glad to help.
My best regards.