I have seen the discs that are just the same as the sit fit cushion at target in the exercise isle. I have bought the sit fit cushion at Therapy Shoppe online for $23 for my son. He has had it since pre-k, he is in 3rd now, still uses it! Weighted blankets, ( not to sound like I am looking for money cause I am not but I do make those for very cheap!) ummmm about extended family they just need to do what you direct them to do, you are busy enough and don't need to argue the " Oh he is just being a boy" remark!. The one that really matters that is on board is your husband. Mine did not and now we are divorced! lol ( that is not why lol) I took my son to a developmental pediatrician at Children's Memorial in Chicago. That is when my x finally realized, uh yes I guess there is some reason why he hops across the concrete on his knees and receives 6 hours of therapy a week! duh!!!! Try and catch the meltdown before it happens, once it happens as I am sure you know it is very hard to get back on track.Sounds lke he might be a sensory seeker, so heavy work, put heavy things in the stroller or cart, get a mini trampoline for inside the house, there are several books that have "games" to do with your child and pertain to each sensory issue! They are really cool. ummmmm I repeat myself all the time on here, but if you have to picture cards, structure and routine are very important. That can help a lot with being overwhelmed. Knowing in advance what to expect if you know for sure what is going to happen, but I constantly tell my son things do not always work out how we planned, he get VERY upset when plans change. hta tis life nad it is important to know. Social groups, library story time, cub scouts, play groups like Gymboree, social groups. Responsibilities at home; mini jobs, help carry the gallon of milk in! Heavy work!!! Find his passion and let him go all out on it! My son's is oceanography and bugs! Guess what we have in containers all over the house! BUGS! Our praying Mantis just laid an egg sac! Yup! I know , gross, but cool. Sounds like tactile issues, with the smash cake. maybe try shaving cream on the table or something like frosting, whip cream, slowly, let him put it on there nad play in it. Cornstarch and water makes really cool " moon mud" add some food coloring and pretend you got it from outter space, there is no smell either! The bumping into people is the sensory seeking part. It is still hard to comprehend, look that one up! hahahahah Tha tis great about the karate, my son it is swimming. No group sports he can't handle them. We tried soccer one year and he cried or would sit in the field! No patience for baseball, he loves science, swimming, and of course computers! Which is fine with me. He did do Muay Thai one summer I thought the hitting and kicking would be good it was for the heavy workout but otherwise he got very wound up! If I think of anything else or come across any more info I'll let you know!!!! Sounds like you are doing an awesome job!!!!! Good for you and your husband!!!

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Oh yeah, visual!!!!! Picture cards, charts, behavior charts, pushups , those were a hit! lol