I like the hidden TBU, thats a cool idea. I recently converted one of these to HL electroncis also. But I used the orginal DBC. One thing I noticed thou was that the turret rotation and gun elevation motors were really loud, Even after I applied liberal amounts of lithium grease to the gears. Your's sounds alot better than mine in the video. Did you do anything to make them run better? It really does run alot better with the HL electronics thou.