I suppose I'm quite differently informed.
There are quite many people with asperger's that have a low performance IQ.
The performance includes various visual-spatial tests. Sometimes matrices, but also putting together designs by using actual blocks, figures and so on.
Some autistic people across the spectrum are great at visual-spatial, but seeing how there are many with AS with a low performance IQ and seeing how also the literature of NVLD suggest that about 80% of those with AS have NVLD/visual-spatial deficits, I don't understand why your profile doesn't fit a type of AS perfectly.
Special interests are indeed also not necessary for diagnosis. Not even relevant in the other manual of medical and psychiatric diagnosis, the ICD-10.
You will just have to fulfil another criterion of the following:
[quote=DSM-IV-TR]
2. apparently inflexible adherence to specific, nonfunctional routines or rituals
3. stereotyped and repetitive motor mannerisms (e.g., hand or finger flapping or twisting, or complex whole-body movements)
4. persistent preoccupation with parts of objects[/quote]
_________________
Autism + ADHD
______
The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett