Personally I think the RTK part should be integrated into Trinity.

One site that I find easy to navigate is the web-broker www.scottrade.com.  Its not going to win any beauty awards as it is fairly cluttered, but the upside is that I've never had to put more than a few seconds thought into figuring where I want to be directed.  In particular, I like how there are spaces on the right so you can immediately login.  Notice also that there is a dropdown menu in the login area that allows users to select a start page.  I also like how they have tiers of tabs; its cool how they set off and drew attention to "open a new account".  I think it is always a good idea to put tabs like this that are important, but only used once or twice per user, such as new account or about us on their own tier.  As for Trinity, I'm not really sure if this type of setup would be applicable; I'm having a hard time visualizing it.

I also agree on incorporating RevTK within Trinity. I take this opportunity to resubmit a suggestion which I posted some time ago and which may sound more relevant in the present context :

Some users may want to practice with Trinity before actually completing RevTK (my case at least). So it would be nice if a connection could be made between the two sections so that the kanji that have not yet been learned in RevTK are displayed differently or even, ideally, transcripted is kana in the quizz sentences. For that purpose, the program should somehow know the kana transcript for each sentence. This could be entered at the time the sentenced is typed in. Actually, I feel that there might be an extra field specifically for the pronunciation, like in Anki, rather than putting all information together in the Note field (one could always choose to leave it empty).
Just my two pence though?