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I’ve been trying to answer this question and your answer makes the most sense. 7.11 x 72 = 512 and 4.75 x 72 = 342. It would be nice to see an official Apple document that references this, but my search foo let me down. The best I could do was Macintosh Repair & Upgrade Secrets (archive.org)...

MacUser July 1986 has a review of the original Mac-a-Mug. You can read an extract in Making Faces: Mac-a-Mug, or download the whole July 1986 magazine from Vintage Apple. This capture from the magazine shows the process of building a face:

If you own a Macintosh Plus, you might like to read A Macintosh History from March 1986: https://systemtalk.org/post/macintosh-history-8603/ “The basic concepts of the Macintosh Plus are enhanced speed, storage and expandability. These concepts are expressed in increased user and system memory...

For Quadra 605 (Performa 475 and LC475) specifications, try http://quadra605.mcdonnelltech.com. It sounds like the 1 MB VRAM is being used on your system: Standard 512 KB VRAM supports 8-bit color for 256 colors at resolutions up to 832×624 and 16 colors at resolutions up to 1152×870 Upgrading...