Why not take a classic text type and try to turn it into a slab serif font? here is the start, using Bembo and The Serif as refrence fonts
The /o is too dark, but looking at it again I've verified for myself that you should be continuing development. Perhaps not to create a true Bembo Slab, but definitely to create a sturdy slab serif with classical proportions. It reminds me a bit of Tribute.
Have any more letters for us to look at?
This looks very promising! Beautiful work so far.