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I guess you currently have a couple of immediate options.
The banner sizes are generally given in the sitebuilder for the specific banner when changed, the text boxes may be apparent on addition or like the custom panles are dynamic and can only be measured after they are implemented.
The second option is a downloadble ruler to measure the height and width of the frames and subframes. I use Ruule and Measure It. and find these work well. They're unobtrusive and can be activated in a split second and then de-activated when not in use.
The third option is something like Firebug which allows you to see the space allocations if defined and you can then take these measures for images etc. it also gives you margins etc. so you can create a very accurate fitting image.