As far as I understand Beaver is Federal owned waters, you will be good there as long as you purchase a Non resident fishing license. Someone else can correct me if I'm wrong....but I can't imagine that you wouldn't be able to bring in an out of state boat. No motor restrictions that I'm aware of....I've seen guys with 250Hp on it. Beaver is also one of the best lakes in the North West Arkansas for Crappie fishing!
Here's a link to the fishing licenses and prices.
https://www.agfc.com/en/resources/li...shinglicenses/
Here's a link to the Arkansas fishing guide book....might be able to answer some of your questions with this.
https://s3.amazonaws.com/agfc-static...gguidebook.pdf
Should be able to find the phone number in the book too, that you could call and talk with the local Corp of Engineer office to check on anything you might not be sure about.
Good luck!