Jay, that sounds like a great option! There are so many ways of providing a base for track and scenery! I first used Homasote in the ‘80s. To me, it was certainly better than running on bare plywood like I did in my teenage years. I’d I didn’t have a used 12’x4’ (that isn’t a typo) sheet of Homasote given to me a few years back, I would have been looking at other options for my current layout, because it is hard to find in my area.
Vitto, I think Jay’s idea goes to show you that you can’t go wrong with any method. I think you have to try options and decide for yourself what you like best.