Look in the codebase for HUDs. there is a snippet somewhere that shows you how to use 3D objects as a HUD, and get the proportions correct. You can apply the very simple formula to your blocks to size them to suit your screen.
It might also be in the code snippets downloads. There is a DBprosnippets zip file, but I'm not sure if that's the one...
ftp://ftp.thegamecreators.com/misc/
BatVink
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