Regarding the cleverness or otherwise of the grid construction, I agree with smithsax and 0pt0.
The jumble at 8dn tied-in to the correct ordering of the thematic material certainly compensates for the asymmetry in my opinion, and to split the entries exactly half and half is quite an achievement under the circumstances.
The unching wasn't too bad - in fact it erred on the generous side - and, although the cluing was easy, the resulting answers were a tougher set than usual.
No quibbles from me - thanks Stick Insect, I enjoyed this one.