She is wanting all of this SCULPTED?!?!? That would be one heck of a cake but one heck of a lot of time and work. There are lots of tutorials for shoe boxes, shoes, purses, and jewelry (if gems, maybe isomalt, but be aware it gets cloudy if refrigerated). You can probably find lots of posts and tutorials here and youtube for those. There is no way I personally would attempt a 3D open latticework Eiffel Tower. I'm a newbie who reads a lot more than I bake. I am guessing the most impressive open latticework Eiffel Tower would be done in royal icing in flat panels and then stuck together. However, it would be very delicate and my hands would not be able to take doing that much icing. I googled "royal icing 3D tower tutorial" and spotted this one, which looks good:http://www.sugarduchess.com/2011/02/eiffel-tower-tutorial/ . Make twice as many pieces as you're supposed to need to allow for breakage.
My suggestions to simplify the cake construction and lower the bill if that would be a concern:
Substitute a purchased model for the Eiffel tower. Is anyone really going to eat crunchy royal icing anyway?
Iced or fondant Eiffel Tower silhouette on the side of the cake like in this pic: http://1.bp.blogspot.com/-atNW4lEdaDU/T3_NvZjDIPI/AAAAAAAAARU/rcndDLe4CMw/s1600/Eiffel%2BTower%2BCake%2B2.jpg