[STUMP] 'Virtual screens' or vertical tiling of groups?

I am wondering if there is any way, or opinion on the idea, to 'tile'
groups much like frames can be tiled. I occasionally find myself working
with multiple projects at once, and for each project I like to have
various applications/views with different groups, so stacking the projects
vertically and each projects applications horizontally would provide
great flexibility.

Something like:

|-----------+-----------+-------------+-----------+
| Group 1.1 | Group 1.2 | Group 1.3   | Group 1.4 | <- Project 1
|-----------+-----------+-------------+-----------+
| Group 2.1 | Group 2.2 | <Group 2.3> | Group 2.4 | <- Project 2
|-----------+-----------+-------------+-----------+
| Group 3.1 | Group 3.2 | Group 3.3   | Group 3.4 | <- Project 3
|-----------+-----------+-------------+-----------+

Where Group 2.3 is the current group and then 'gnext' would take me to
2.4 and 'gprev' to 2.2. Two new functions, e.g. 'gup' could instead go
to 1.3 and 'gdown' to 3.3. 

I guess this is sort of a virtual wall of screens.