Just to bring a little bit of a.h.r back to this thread, I once worked on a volunteer project where we framed over a walk-in baptismal font to expand an office.
On old church had been turned into a community center. The main sanctuary had a walk-in baptismal font at one end and they had built a wall in front of it to turn the sanctuary into a gym. Behind the font was the wall of a small office area which was probably a sacristy at one point.
Anyway, the walled in font area was wasted and we designed a floor frame system so they could expand the office over the top of it. The font had steps into it on 2 sides, a "ledge" for the priest and guests to stand on, etc.
It was quite a project to install the joists and get them even with the existing joists from the office area, but we got it done.
One of the many satisfying United Way projects a team of us worked on year after year. A dozen stick-built picnic tables at a group home for at-risk kids, a huge deck at a food pantry, massive storage shelves at the same location, etc. 10 years of projects until the corporate downsizings split us up. Now we meet for drinks a couple of times of year to laugh about the old days and talk about what's happening in our life's today.