Re the grid (h1982 and others):
Much of the grid can be filled in from the entry lengths and the 90-degree symmetry. For example, top line has a bar between the 9th and 10th cells. Similarly, the bottom line has one between the 5th and 6th. Symmetry tells us that the first column has a bar between 5th and 6th and the last column has one between 9th and 10th.
You can cross-reference the down clue lengths with the likely row split (where there is little choice, making it a bit less difficult) to add at least some bars to a few more rows and columns. The order of the down clues should help you fix the row split.
There will likely still be a few grid ambiguities, but when you pencil in the clue answers, you should start to see what's going on.
i hope that that helps.