The kitchens that require more storage area need the remedy of assembling all the kitchen cabinets so that less space could be occupied by maintaining the aesthetics of the kitchen. You can always choose the ready to assemble kitchen cabinets as a part of your remodeling plan. Several home improvement stores have got these cabinets. You can easily utilize the idea into something useful. The cabinets that you already have can be blended with these cabinets and it wouldn't have any bad effect on the kitchen or the storage.
As I mentioned above, you have the option of using a piece of 1' x 3' lumber for the installation or building a frame to support the cabinets (I have included a picture of a sample frame below). This can be made out of 2' x 4's and should be tall enough to support the bottom of your wall cabinets. If you plan on installing more than one kitchen, then I would suggest the frame, but a piece of lumber will do just fine if this is a one time event. In either case, you will need another set of hands to help with the installation.
If the wall is flat, simply rip the filler board to the required width and fasten it in place. If the wall is irregular, you'll have to scribe-fit the filler board. Start by setting a marking compass to the width of the gap, then place a strip of 1"-wide masking tape along the filler board in the area where it needs to be trimmed. Clamp the board to the end cabinet's face frame, then trace the wall contour with the compass. Remove the board and cut along the scribe line with a jig saw, then reinstall it to check the fit. When it's right, drive screws through the adjacent face frame into the edge of the filler board. Screw or nail the other side to the cleat.
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