Context postcard 'grid'

As I produce most of my work on photoshop or illustrator, I'm alot more comfortable making my own grids on photoshop that one in Indesign (this is no doubt a negative but I'll stick with what I know for the time being!)

So below is the grid I am using the back/information side of my postcards:

- In the left column these will be the image from the front and information about that image.

- In the middle and the right column, there will be the artists name at the top (spanning across both columns), and interview with the artist or information about the artist in the 2 text columns below.

- At the bottom will be their agent and website address.