I posted just a few days ago slightly peeved at myself that I'd made such a rookie mistake with regards to my grid. Well, thankfully the fixes actually took a lot less time than I imagined, and by Saturday morning everything was in working order again with the new "4 squares" rather than two.
So soldiering on with Landscaping, and the GUI window associated with landscaping I did, and it's already looking fairly polished. Users can raise and lower land, and then use the level tool to flatten an area of land to a given height. I won't bore you too much with where the remaining areas are to polish up as they certainly won't be there too much longer.
Something that has worked surprisingly well was the small indicator (in fact, just a white cube) showing which vertex you are currently hovering over… something best demonstrated in a video!