remember that if you make yourself a sort of moving target he'll most likely follow you. practice in the house or in other places where you know you'll get good results so that you can
reward a lot and build up to other places where he is less likely to come when called.....
it may be a good idea to have some practice sessions just outside of your work shed that do not end with him going inside...just some short sessions...so that he doesn't associate the cue given there as an end to fun...maybe take him out let him go a short way then call him back, reward heavily, let him go a short way, call him back reward heavily...then go off and do your business, come back and have a few repeats of calling him to you and letting him go again....then going out and about again...mix it up at different intervals of coming and going from the shed.
you may want to schedule his feeding times around his shed/kennel times too if that is possible...that way he is a little more excited about going in. if that doesn't work you can try stuffing a kong with something that he likes and
only giving it to him at those times...a really good chewy/toy/treat may make him want to go in to get it. in the mean time, you may want to pick him up before he wonders and just carry him into the shed if you are rushed...that way he isn't associating your cue with something unpleasant.
you are correct, he is doing quite well for 14 weeks
...keep up the good work...
if you can, there are some really helpful videos on youtube that demonstrate clicker training and different techniques to get a desired behavior....
It just sort of happened one day. We had him off leash in a fenced park (not a dog park, technically not an offleash park, but no one ever goes there so we did use it to teach off leash). We walk in one direction and when he went to far ahead, we recalled, and spun the other direction. As soon as he passed us, we turned around the other way. Eventually turned into silence and just changing direction, rewarding him for following. This taught him that it is his responsibility to watch us, and follow us. It's worked wonderfully. 
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