Redmine

Hello everybody

I need help in a difficult issue. I tried to post in the Forum but I didn't get a answer. So I try it this way. I want change the landing page for some users of my redmine application. So let me explain it a little more:

I have 6 projects in each I have some users who are old (not really but a little clumsy by using a cumputer) and they get sometimes an issue from me. The different projects because a user XY from project a shouldn't see issues from project b but XY should see all issues in project a, also the issues which are assigned to user YY.
My vision is now, that i modify the controllers, views etc. So that the users who are members of project 1-6 automaticly rederected to a page which contains:

all Issues of the project (no editing only show)
    a logout button
    All the other stuff of redmine is very confusing for my users and they are not able to use it. I tried it for some weeks.

I tried a few things. Which means edit controllers and views and make a new view. But when i load readmine and try to login there are a plenty of errors.
I find a Method? in the model "user", the name is "member_of". This needs a project and give back true if the current user is member and false if he is not. With that I want to modify the controller "account_controller" in the method "successful_authentication". (something like "if user.member_of("blub")=>redirect_to...)

I hope i can find some help here. And i hope my explanation is ok. Sorry for my bad english.

Regards
Kalle