I am currently working on an under floor heating system for the whole
of my downstairs.

Approx 50 M2 of floor area.

What I am looking into doing is feeding the hot water DCH pump from
my office woodstove to a heat store of approx 500L then pumping via a
heat exchanger submerged in the heat store through the heating loop.

Has anyone built a similar system?

My home has a wooden floor (Floor boards) and I intend to screw the
heating pipes to the underside of the floor boards and then clad and
board the undersides of the pipes so as to transfer heat into the
flooring..

Just looking for ideas and thoughts on such a system