They are nailed it and they were built on site.You just need a good pry bar and hmamer and wear leather gloves and some eye protection and tear them up.
With wood flooring, its betetr to install the cabinets 1st as not to even take a chance of scratching the floors. Just boost up the cabinets 3/4" as not to lose toe kick space. This is very true if some one else is installing the cabinets. Not so bad if your doing the cabinet installation, you ll take care. If your doing all the work, you can install the wood, just know where your new ones lay out and you can put wood just where cabinets, stove and refridge are going. Or just waste some wood and do the whole floor. Done it all these combinations for 20 years. Any questions you can e mail me through my avatar, GL