As for the contents, I did some precise calculation and here's the optimized combination.
For the bricks.
1x1 blue 20 pcs, red 20 pcs, white 78 pcs
1x2 blue 5 pcs, red 5 pcs, white 16 pcs
1x3 blue 5 pcs, red 5 pcs, white 20 pcs
1x4 blue 8 pcs, red 8 pcs, white 25 pcs
Some white 2x4 and 2x2.
The black 2x4 is to make the plate stand.
Angular brick and 1x2 plate is for consumers to place LEGO mini figures beside your name.
For the plates.
I name the 5x2 plate as the connector. They are to combine the base plates as you can see also in the below picture. The base plates are 2x thicker than standard and leave the side 1x thick to connect to one another.
In the below, the plate is grey, but maybe white would be better.
So we have...
7x2 1 pcs, 7x3 1 pcs, 7x4 1 pcs, 7x6 3 pcs, 7x8 1 pcs, 7x16 4 pcs
With all these 7x width plates. You can build the below.
7x5 ~ 7x16 within 3 plates and 2 connectors
7x17 ~ 7x40 within 4 plates and 3 connectors
7x41 ~ 7x56 within 5 plates and 4 connectors
7x57 ~ 7x64 within 6 plates and 5 connectors
But if you use all the plates and connectors below. You can create a 7x99 base plate. 14x40, 21x22 also possible.
I also put the unit for consumers to hang "the PLATE" on the wall as you can see the below picture.