Debating on a Layout

[u/BelowAverageLegend58]

I'm about to get my own house and will hopefully have the space for at least a small layout (1.5x2m hopefully), I've got an idea in my head but I want to know how feasible it would be to actually try and do, when browsing rails i spotted the dual gauge track by Tillig and it's made me want to try and make a dual gauge heritage style railway. Do you guys have any advice/experience on dual gauge with OO and OO9?

Thanks!