I have seen a shoe box cake on this site with the gumpaste tissue paper the box top a little open with the tissue paper coming out, can anyone tell me how to make the shoe box come open with out it sliding off the top of the box? Can anyone tell me how to make the whole cake?

Just make a regular box cake and decorate it as desired, make a lid with GP or a layer of cake with base of course and decorate, put the top of the box a little offset and roll the GP or fondant very, very thin so it looks like paper and fill the gaps with it. HTH

I have never made shoebox cakes, yet (Sorry I cannot help You)
But I wanted to say Welcome to CC
and to tell you that Sharon Zambito from www.Sugaredproductions.com
Has great tutorial DVD's that is where I buy mine from she also has one call boxes, and bows.
She has DVD's from Perfecting Buttercream, To Stackings cakes, And Flawless fondant.
There are also a lot of great tutorials on Youtube,
Also look for tonedna1 she has great tutorials on (Youtube) she also has a great gumpaste DvD that she just made, her site is www.Designmeacake.com
Just wanted to point you in the right direction HTH.

When I made mine - I just took a 9x13 and cut it in two. And then stacked it.