Well... I did it.  And I enjoyed the process, at least up to the final 20 or so ninjas I needed to find (even more annoying on diamond painting than on cross stitch). 
Close up, I have to admit it still feels a bit too pixelated for my tastes.
To keep the piece secure, I used Mod Podge glue which dries clear and adds a glossy layer. It will help to act as a kind of grout for the little tiles.  It feels really odd before it dries, good job I've used this glue before and trust it to dry clear!! 
Add a frame, and it is ready to be displayed, where it can be viewed from a more acceptable distance.
I definitely like it better framed and with distance.  The original print is also a faded background and that comes across more with that physical distancing from the finished painting. 
Still looking for just the right project next, where I can complete from start to finish.  I have my eye on a couple of things, as well as some sticky background to use with other charts, as you would with a counted cross stitch.