Altar tables are Made to Measure with a fixed frame; please check if access is a concern.
Oak tables by Heerenhuis are finished with three layers of invisible matt varnish and should be cleaned regularly with a damp cloth. The varnish contains a UV filter which prevents any yellowing of the oak in sunlight. No need to oil or revarnish.
Heerenhuis make contemporary furniture in the traditional way, using authentic materials.