Invisioning my own 16th dozer & it's cyls while looking at your's Dan, knowing that the steel oil line running down your cyls is 5mm dia would be like a 1mm line on my own comparison wise... gosh that's a huge model you're building!
Your track tension apparatus is quite ingenuis.
do you have some means of locking the cyl in to slip the track on? ...in case you ever skip it off while turning.