Had ours done about three years ago, very pleased with the company that did it [
kitchen-restorers.co.uk] based in Sutton Coldfield (factory in Aston) planned it all out for us, used the space to the maximum for our galley type kitchen, flooring, wiring, lights, gas, hobs and installation of white goods etc and designed and built 2 custom cabinets also to surround 2 cookers and a boiler on wall as well.
Have their own factory that builds frames, doors etc to your requirements from designs. Had a fault with one of the cupboard shelves after 12 months came out same day and sorted it.