Thanks Mr Painless, time will only tell
I was mucking around tonight with the gadget that is supposed to attach the end of the barrel to the recoil unit. Trying to make sure it will retain the barrel no matter the forces involved.
Trimming off the insert that goes into the actual barrel to do the forward-ing & backward-ing !
I was looking at the barrel length and trying to get perspective on the entire thing in case I have to reposition the Taigen unit.
Then a thought.
The barrel looks about 'right' when its in full battery(all the way back)
My theory is that if the dimensions of over all length for models are based on how it looks(& measures) when the barrel is positioned after the recuperators are drained & a round fired, then it looks right. (JT 331 at APG looks like this, or it did when I saw it)
Still an impressive barrel, but somehow it looks better sitting back inside the mantlet sleeve.
Now I may be on the crack pipe, but this is not about the right dimensions, but about the right look..............
Holding the original barrel assembly next to the new one in full recoil they are almost the same length and position relative to the casemate front plate.
The distance the Taigen recoil assembly travels is 25mm(1 inch for you left hand drivers), which added to the increased length of the TMB barrel assembly gives me the 36mm (a shade short of 1 1/2 inches)extra length when measured out of the bag.
Could be that JT models are made to look right rather than measure up accurately..............
Those of you lucky b'stards that have torro JT's can chime in with your measurements, just to clear up this conspiricy theory I've talked myself into

HL JAGDPANTHER,HL TIGER 1,HL PzIII MUNITIONSCHLEPPER, HL KT OCTOPUS,HL PANTHER ZU-FUSS,HL STuG III,HL T34/85 BEDSPRING,
HL PZIV MALTA,MATORRO JAGDTIGER,HL F05 TIGER,TAMIYA KT,HL PANTHERDOZER,HL EARLY PANTHER G,TAIGEN/RAMINATOR T34/76,
HL AN-BRI-RAM SU-85