Do you feel confident that your guided Rainier, Hood and Grand Teton experience and training prepared you for unguided ice and snow climbing? Both the MR chute proper and the final 400 should be expected to hold a lot of both, at least at this point. Late April can be full-blown winter conditions or a big bluebird melt. If you are driving, I would be prepared for both and make equipment selections just before starting. You may be able to push it in one day - many do - but I would not go up unprepared for an overnight.
