Even if you use flat-shading there is still the prob that the textures will not be interpolated over the seams...also these chunks are surely just placeholders and the final versions will look more organic (or not?), so flat-shading would not longer give well looking results.
I still prefere the unique look of hand made environments, but actually it is possible to overcome both problems (non-seamless shading and textures) without making compromises in quality...Iīve already experience in that area because I developed a terrain editor wich can merge single chunks absolutly seamless together and I also made something similar with model chunks in the near past.
Itīs a lot of work
but I could do it for you if you really need it now...
just PM me...
a pic of my last small project:
there are six chunks with seamless shading
