Elaine ,
The new Gettysburg Visitors Center was open when we were there at the end of April of last year. The Diorama was moved and redone from the last time we were there. That was very impressive.
I think you're right about taking 5 days to get to TR if you are doing 6 to hours of drive per day. It took us 4 days from Gettysburg to home in Kalispell, MT. and we drove 10 to 12 hours a day at 60 mph. We could have gone faster , but the milage go down alot if we go much over 60.

We wanted to do Harper's Ferry, but were getting short on time and wanted to stop at Gettysburg more. So it's another one of those places to put on the list for next time.
We went to Kanab, UT in April, five years ago. Got a vacation rental house for a week and used that as our base. We went to Brice and Zion NP's. Hoover Dam. Cedar Breaks and Coral Pink Sand Dunes SP.But, Not necessarily in that order.
You ever get that feeling, so much to see and so little time?
Jim