Here with Architect's Journal link to an interesting refurb project after a major fire in Clapham Junction.
The architects worked closely with the community over several years in a way that could be adopted for the Drill Hall:
21 NOVEMBER, 2018 BY MERLIN FULCHER
Haworth Tompkins’ restoration of London’s Battersea Arts Centre was nearly complete when a devastating fire destroyed its Grand Hall. But the subsequent rebuild has created a beautiful and beguiling space, says Merlin Fulcher. Phototography by Fred Howarth, Philip Vile, Alex Brenner and Nicholas Hartwright
Immersive architecture: Battersea Arts Centre by Haworth Tompkins | Building | Architects Journal
With more from the Metropolis magazine:
After a Devastating Blaze, London’s Battersea Arts Centre Makes a Dramatic Comeback
London-based firm Haworth Tompkins has given the 19th century performing arts hall a sensitive, yet triumphant, new lease on life after a 2015 fire.London's Battersea Arts Centre Makes a Dramatic Comeback