80cm is inauspicious. Thus other than the standard measurement of 60cm; Perhaps may consider either 67cm or 68cm instead.
Height of altar opening is usually in multiples of 43cm. Thus can be 43 x 2 or 43 x 3 etc...
Minimium depth of altar cabinet should instead be 40cm not 30cm.
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|I did a search in this forum. And there are as many as 531 postings or threads on this subject.
And the messages goes back to 1999.
There are more than adequate examples of anything related to altars.
Thus other than anything out of the ordinary; please go thru the above to have a better understanding ....