Hey, I'm from Reddit. I registered an account here and waited through the approval period just so I could post in this thread. The first image in your set- the 'Ideal' Trench- keeps making the front page of Reddit and Imgur, and it's being reposted unattributed. It's very popular there. Fortunately some nice people in the comments have been linking back to here on some of the posts, but I really feel the one image on its own without context isn't doing your work justice- also, if you care about imaginary internet points, someone is stealing yours.
Reddit and Imgur are extremely friendly to creators coming in and taking claim of their work, and if you made an Imgur gallery of your finished trenches with some historical context, and a separate one showing some of your construction process, and posted them both to appropriate subreddits on Reddit, I think they would both be received very very well. (Use a different headliner image, though- otherwise they'll think it's another repost.) To clarify, Reddit is a link aggregator and discussion forum that does not host images; Imgur is an image hosting service, with its own front page and separate comments system, which is the preferred image host of Reddit.
Here are the posts I can find where your trench model has shown up, in chronological order:
http://imgur.com/gallery/C7FNBkb
https://www.reddit.com/r/ThingsCutInHalfPorn/comments/4ep2dx/the_ideal_wwi_british_trench_1024x768/
http://imgur.com/r/pics/iSEg9e4
https://www.reddit.com/r/pics/comments/4gjpil/the_ideal_wwi_british_trench/
https://www.reddit.com/r/interestingasfuck/comments/4gkw31/british_wwi_trench_cross_section/
Note that the Reddit posts are just linking to the Imgur posts; the first Imgur post has its own comments, but the second was set up without them.
Again, I really strongly encourage you to resubmit your work in a full gallery and take credit for it, with your own brief descriptions on each photo. If you'd like to link to the exhibition as well at the same time, you'll probably get some attention for it- there's over two million views on the picture of your model already, and some of them have to be from people near enough the exhibition to attend.