You run into more tricky things then the surviving relatives. If I am not mistaken the State of Michigan has put an end to all diving on the wreck for a couple of reasons. One, it's depth, shallow by Titanic's standards but below normal dive depth and requires some sort of submersiable. Two the condition of the wreck, there is a lot of twisted metal down there and the average amatuer diver could get him/her self killed very easily. Then you have another question. Gaining access to the wreck if you are allowed to dive on it.
All of the doors (with the exception of one on the bridge) are dogged shut from the inside, and all windows (with the exception of the bridge) remain intact. The only enterance to the interior of the bow section would be down the captains stairwell off the bridge into his cabin and out into the passenger/crew accomadations from there. However, I doubt highly that would be able to get any lower on the ship then the spar deck (aka the cargo deck). Dunnage, which would lead to the rest of the deck crew quarters, windless room, forepeak and access to the holds is sealed off by way of the closed dunnage door on the spar deck.
The stern lies upside down, enterance would be possible through one of two engine room doors, but cutting away would be necessary. Enterance from either (bow section or stern section) open cargo area would stopped by the next division of the holds.
The wheelhouse to my understanding has been photographed (although I have not seen them) in detail, but that is the only portion of the interior that has been (to my knowledge) entered.
Another question is how far into the wreck do you want to go. Remeber that there are 29 (25 if you take out the bridge crew) bodies still onboard the Fitz. Nobody alive know's where they are, or what there condition is. The ice cold waters of Lake Superior especially at 500 feet down could have frozen the bodies and to some extent could still be recongizeable.
Then you have the very superstituios nature of sailors on the lakes, and disturbing the wreck to much could cause quite an uproar.