I am surprised the Jack Handle is interfering with the exhaust shroud but shortening the length of the handle should certainly sort that out,
I have to say that my advice is --- Always, NO EXCEPTIONS!!! do a dry run first, and in the case of a Back Plate where multiples of fits have to be made then lay out the backplate and place all the planned fittings in position, then using a marker mark the exact place where everything goes, That way you wont get caught out later,
This also is worth considering when fitting tools etc on the Tank body.
I would have suggested you move the jack body a little further to the right but in your photograph it looks good. So as I say I am a bit puzzled,
UNLESS, Call me a fool but you do have the exhaust shrouds on the correct side don't you?
I ask because Even I, yes your hero, has made that mistake,

fortunately before holes were drilled and glue applied I discovered the error, and that is one of the reasons I always do a dry run on any fit.
By the way while you are working on the backplate will you be fitting a starting handle along the base of the plate? There is a proper way as per the real thing where the handgrip is actually swinging below the level of the back plate and a modelling way that saves the handle getting damaged. This is a part that does need to be included in a dry run because it is a tight fit getting it between other items,
Shaun.