Hi BLWJ,
   I'm happy to hear you're catering a lesson plan specially for your son's interests and needs! Out of curiosity, I'm assuming by 9-12 you're referring to his "grade" not "age" correct?
 
There are plenty of opportunities to teach science with a more hands on approach. For starters, take a look at our "high school science activities" which can be done at home for some fun ideas:
http://www.education.com/activity/high-school/science/
 
Furthermore, here's a good article on what goals high school science should focus on to emphasize in your teaching:
http://www.education.com/reference/article/overview-goals-science-education/
 
Finally, there are many computer program curriculum that exist out there for those who enjoy using technology, here's a couple links of some programs that you can look into purchasing:
http://homeschooling.gomilpitas.com/materials/ScienceSoftware.htm
http://www.dmoz.org/Computers/Software/Educational/Science/
http://www.homeschooldiner.com/subjects/science/biology.html
http://www.homeschoolbuyersco-op.org/index.php?option=com_quickbase&Itemid=438
 
hope this helps!

First, be sure your son has dyslexia. Many experts say it's a side effect of sight-word reading. See article.
 
(Also Google: "28: Tips for Helping Your Child Do Better in School.")