im just starting too so take this with several grains of salt:
Just a few minor things, more of "heads up"s. I liked all jack/beast lists but theyre not very good if you like to win, i would add at least one more small squad in maybe archers or swordsmen. As your list was similar to mine, and that was what i got for critique. Thagrosh also isnt really a "beast caster", i thought so but hes more of a glass cannon assasination caster. Also, im pretty sure a spawning vessel can make lesser warbeasts and i think it was around the cost of a few shredders. so you might give that a whirl.
best thing to do is ask ian or matt on thursdays, or riley, since he plays the all beast "zurg" army. you can always proxy it against me since im learning too so it would give you a long enough game for you to try stuff out and figure what works. alot of the game is of course playing over and over tinkering until you get something you like.
best of luck though
