Go to Walmart and buy one, or go to a yard sale and buy one. To produce a custom vacuum means custom parts and custom pieces... so It will be very expensive...
Get a job with a manufacturer of vacuum cleaners.
You'd be better off buying one, if you just want one for your own use. The money it would cost to assemble the things necessary would be more than the price of a new vacuum cleaner. If you want to go into manufacturing them, the smartest thing is to first work for a vacuum cleaner company, or a vacuum cleaner manufacturing company. That way you will find out what is needed and how much it costs and how it is marketed, and other things you will need to know. Then you can start your own company with knowledge.
