Well I see you went crazy with the cybork bodies thing, thats a lot of points spent on cybork, points that could be used for more boys. So that leads to a few suggestions;
Drop the cybork from the boys, lootas, and death copta. Add more boys to make them 30 strong, put the lootas in cover as it is a better save, and make the copta a green baron by adding the saw.
9 PKs in your nob squad is heinously expensive, drop that to three PKs and make the rest big choppas, this way you can attack at initiative and still cause a serious amount of damage, and the 3 PKs can be used to kill off AV14 and MCs.
Use all the left over points to get another squad of boys, I suggest the second squad be shoota boys with max amount of big shootas.
The Ard Boys do not need the cybork, having it is fun but expensive, if they are going to be traveling with the mad doc a 4+/4+ save will make them last a long time. Try them out a few times and you will find that the cybork does not do anything except cost more points. The one exeption is if you send them after the cheesinator squad. (7 assault terminators led by a chaplain 5 sets of claws and 2 hammers, riding in a cruisader) Then your cybork will save some but you will not get to use FNP from all the power weapon strikes. However, if you love the ard boys then keep them with the cybork as you may actually get to use it at the tourney. Just for the record, the nobs are the better match for the cheesinator squad.
The best use for the looted wagon is for the boom gun, using it as a skorcha buggy is the expensive and slower way to get the skorcha into the enemy. Get a skorcha buggy (for less points) or two, they are fast so you can put red paint on them and still go 13" to deliver some heavy flamer fun, while a looted wagon can only go 6" to deliver its burny dance template.
Lastly, I am not a fan of Ghaz, he is overpriced and an extra waagh is not that big of a benifit for a slow and purposeful model. Take a warboss on a bike so that you can keep up with your nob squad, and he can split off for some vehicle killing while the nobs take on the big nasyies.
Hope that helps.