I currently have my amp head in a regular size 4 space SKB rack case and want to get a smaller shallow case. I know the GK 700RBII takes up 2 rack spaces and will fit it a 2 space shallow SKB case, but will it not have enough space to properly vent because it vents out the top back? Anyone use that small of a case with their GK head, or should I get a 3 space for the extra venting room? Thanks for any help. The amp will be the only thing in the case.