For kit No 6232, i have it and the metal barrel it provided with it is incorrect. Length of the barrel's mid-section is too short. That's the only glaring error. You can still use the plastic barrel though.
No. 6254 is the battle of the bulge KT right? If so, i say you should just get 6254 instead of 6232. Just for the corrected metal barrel.
I'm building DML's earlier king tiger (no. 6208) and its a great build! I reckon the newer King Tigers will be great too as they share almost all of it's sprue with 6208.