Although De Havilland were responsible for the design, a number of subcontractor companies were involved in production. Furniture manufacturers made many of the parts, and wings that were sent to the final assembly plant.
A similar aircraft, built earlier in the War by Westland, was the twin engined single seat Whirlwind. It had four cannon in the nose, and twin Rolls Royce Peregrine engines. It was very fast low down, and served in only two Squadrons because the engines were very unreliable and prone to overheating.
https://www.youtube.com/watch?v=usjB_5HbW7M
https://www.youtube.com/watch?v=i-gwYZSqvSI