One reason I stopped buying Dominion expansions is that the three boxes I have now take too much shelf space for the game that Dominion is. If they would sell me an insert like this, I would actually be open to buying a new expansion!
I have a similar setup with my premium thickness FFG sleeves. One box can hold all the cards (up to alchemy) and the seaside tokens, but not the seaside mats.
It only took me a few hours, with some thick cardboard and tape. Not as hard as it looks! Just use a ruler and some forward planning.
Tell me I'm not the only one that just abandoned the actual Dominion box before any expansions?!?! I moved to CCG white cardboard boxes a LONG time ago, and have just updated the size with each expansion, currently everything is residing in a two row box and a nice color copy of the box art resides on top!
I totally agree with David on this one. There are many people that are coming up with cool ways to store their sets. For me, the CCG boxes work just fine and I can pick up one at the nearest sports cards store for less than $1.
?? 
!!
