Tons of fun, Fez. FOI: 3d (naturally). That & guessing 1d & 2d before I could parse them got me through the rest. Loved 4d, absolutely terrific work there. Thanks for a great solve.
Very impressive. I imagine you based the grid around 1a and 4d? 5a got me a start, after which I started to make steady progress. Some tricky parsing, but surprisingly little given the constraints.
Very nice! Hard to say what my perfect clue was, since the whole thing is one big surface, but I liked the construction of 1a. Tiny spoiler in comments
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