Okay, so, trying to get all of the comments in one place.
Stronghold specifics:
* Ashabenford is a Small Town by SBG rules. It's within 112 miles if you're building on the river, or farther away if you're building on the plains deeper in 3RL. So that would be either a +7 or +10% modifier
* Superior masonry walls cost 3,000 gp per stronghold space. For a 7 ss building, 70% of the walls are exterior, 30% are interior. So the exterior walls are 2,100 gp per ss. If you go with wood interior walls, those are free, since I assume everything is on a single level
* 21,000 gp if all walls are superior masonry
* 14,700 gp if the interior walls are wood
* The freestanding wall's cost depends on how big an area you want to enclose. Probably the smallest practical wall would be 340', which gives 10' between the wall and the back and sides of the lodge, and 20 feet in front. (see rough sketch below). That would cost 3,400 gp for a packed earth wall and 102,000 gp for a superior masonry wall, for instance. You would also need either a gatehouse, or to leave an opening in the wall.
* Everything else looks fine, though it's kind of a weird mix of things. Also, are the barracks for you, or for your staff? If it's for you, where are you putting up the people who would, I assume, be living there full time, keeping the place up and guarding the stuff you put in storage?
* Also, since you're very close to the forest, you can use the -10% cost to wood walls cost modifier
Spells:
* Rock to mud only works on rock. It does not work on earth. Same with stone shape. For either spell to be effective, you would need to excavate until you hit rock, which in rich agricultural land like the dales can be twenty feet or more
* Sandstone, on the other hand, is a perfectly acceptable building material. It's obviously not as durable as something like granite, of which there is a lot in the Dales, but it definitely can be used.
* By RAW, walls of stone remain permanently vulnerable to dispel magic. In practice, I agree with Corym that after a couple of months at most it's permanent and would need to be taken down by other means.
* 5th level is starting to get into the area where it's hard to find scrolls, or wizard willing and able to trade for it from spellbooks. You would need to go searching. And if you found it on a scroll, you would still need to do spell research to add it to your books.
* Regarding spells per day, you have to have 8 hours of rest before you can memorize spells, barring unusual circumstances like the
nap spell. So you usually only get one load out of spells each day. But you can memorize as many instances of a spell as you want for each level, up to your max allowed (i.e. you could memorize all magic missile in your 1st level slots).