Somebody a little while ago was kind enough to let me fly an X'Air, which is a BMAA homebuilt microlight. This example had a Jabiru engine, which I believe is a bit of a rarity on the type.
Looking through the manual (which was clearly approved by the BMAA) it consisted of a main bit with no performance figures or most of the limitations in it, and a couple of specific to aircraft annexes, including the engine manual, W&CG report, and a document from BMAA which listed the main handling points, performance data, instruments fitted - most of these were placarded as well.
Whilst I've enough hours in similar types that I could probably have flown it safely, it was a very useful document. I can't see it would be that hard to put something together, presumably in conjunction with the test pilot, on a particular aircraft - perhaps based upon a template of some description?