Can you build accurate models using 100% LEGO elements by following Megablocks instructions? I shudder when I find errant MegaBloks in my LEGO elements, but admit to admiring certain in-the-box models offered by them. I know the pictures depicted on the MB boxes are not actually photos of a completed MB model. They are computer enhanced images of what an ideal model would look like if MB pieces actually fit together correctly. Is there a link with images of any 100% LEGO element models built using MB instructions? If there isn't a link, can someone please post an example?
Not necessarily.

It really depends on what you mean by "accurate."  Most (probably 90% or more) of Mega Bloks elements have identical, or at least functionally identical, LEGO elements.  However, there are a number of Mega Bloks elements that you can only approximate with LEGO elements.  For example, Mega Bloks hinges rotate around the center of mass through 100+ degrees center at the vertical, whereas LEGO hinges rotate through 90 degrees from horizontal to vertical.  Also, Mega Bloks has a SNOT piece with studs on both sides that LEGO unfortunately does not have.

If you are willing to slightly modify the instructions and accept a slightly different model, then yeah, you can reproduce anything made by Mega Bloks using LEGO elements.  But if you want the models to be 100% accurate, then no, not all Mega Bloks sets can thusly be reproduced.