Wow you used henglong rotation. Thats some work to convert. I never thought of doing that on a tamiya hull. I did it on my nick jumbo which was made for the tamiya rotation but i wanted to try the hl unit conversion. Sadly, i think it would have worked better if i had used the tamiya system.
nicks turret works great with the stock tamiya rotatin system. For the e8 you just need to install the cross bracket in the turret and then cut it in the middle to make room for the recoil to depress,.
im curios why you did all the work to use the HL system. Do you like it better or was it a matter of parts on hand or something else?