Oh my god! He is exactly like I remember myself as a child - I even had the fixation on Komodo Dragons, and had a stand-up classroom argument with a teacher about dragons that were lizards 'this big' (holding out my little arms) that existed on an island when she said I was 'being silly and making it up'
The objections to stories chime a) with this being a sanctuary of intelligent information he misses all day and b) quite an advanced understanding of the politics and roles of parents, authourity figures etc.
Don't panic by the way, a friend of mine's son is clearly gifted and enjoys older company, which has led to him having strong positive relationships with a senior director of a public body, and an academic in a University at age 16 - odd to kids perhaps, but a great asset too!
I would dispute that not wanting to put effort in is an ADHD symptom in this case - it sounds (with the direction of you) like he has the common problem with perfectionism - what he understands is possible is so far in advance of what his body can actually do, he isn't prepared to a) accept and be patient about his body catching up or b) that a result that is less-good than he imagines is acceptable - great if you are a designer and planner, but not if you are at school! - the key here is to explain (perhaps by you learning a task too - perhaps alongside him) that his body needs a different type of learning to get better (try teaching juggling to yourself with him directing - you can describe where the balls should go, you know what to do, but at the start your body won't let you).
If you keep reading with him followng the words, he will pick up reading, - it may be that on his own he just can;t get the information fast enough, and since getting the information fast is what he is interested in, he gets frustrated (that and the closeness of being read to is very attractive!)
Sounds like you are doing many things right, but he will need to learn (not intellectually, emotionally) that motor skills take more than just mental effort to understand.
if its any consolation, I hate DIY for exactly the same reason even as an adult, and even when I know so don't be too hard on the little chap!