This might help.

This is the tallest gantry side out of this model I use. This would give you 230mm from the lowest point under the gantry, which is the bottom bearing plate, to the top of the profile. This doesn't account for the bed or spoil board.

Click image for larger version. 

Name:	side.jpg 
Views:	1115 
Size:	45.7 KB 
ID:	29922