JaneEdwards72, if you need a kitchen quick, I do not think you'll get it from Naked Kitchens. From the day that your plans are absolutely completely finalised they'll tell you that it will be 6-8 weeks. But the key is how long does it take to finalise the plans? Our experience was that it is a long, drawn-out affair that tried even the patience of our architect -- a conscientious and detail-orientated professional.
If 6-8 weeks seems quick to you, then my advice is to go to them with the most excruciatingly detailed plans, fully measured within a tolerance of 0.5 mm, know what materials you want, what colour paint, buy the handles, etc, etc. You'll also need all the installation specs for all the appliances (except the ones they supply). These you can find online, but it's your job to find them and supply them. NK will then produce a rendering quite quickly and if there are a minimum of changes, you'll be fine. But our experience was that each change was like a hydra's head, you made it and then 2 more popped up to be approved.
Good luck!