Put on your safety glasses.
Cut the MDF into two pieces for the router tabletop with the circular saw or a table saw, according to the size for your needs. A standard store-bought router table is 24 inches by 34 inches by 1.5 inches thick.
Glue and screw the top together; the tabletop will be a sandwich of two layers of MDF. Do not use screws where you will install the router plate.
Cut a piece of laminate that is 2 inches larger than the top on all sides. You could skip this step and just wax the MDF top with a nonsilicon paste wax. However, the laminate is a better-quality top.
Apply contact cement to the back side of the laminate and to one side of the MDF.
Wait for the contact cement to dry. Place a few strips of scrap wood on top of the MDF. These will keep the MDF and laminate from touching while you position the laminate.
Remove the scraps of wood one at a time starting at one end of the tabletop, and let the laminate and MDF touch. Continue removing scraps until the two are together.
Roll the laminate to remove any air pockets and give you a smooth, flat work surface.
Remove the laminate's overhang using a router and trim bit.
Wrap the edges of the MDF top with a 3/4-inch-by-1.5-inch piece of hardwood. Round over the sharp edges. This will picture-frame the top and protect the edges from damage while also upgrading the table's appearance.
Attach the router plate template to the tabletop with double-sided tape. If you plan on using the router table to make mostly moldings and edge work, place the plate toward the front of the table. If you plan on milling large panels that need support, place the plate toward the rear of the table. For multipurpose use, place the plate in the middle.
Rout out material from the inside of the template, according to your router plate's specific directions.
Install the router plate on the tabletop.
Measure your miter track and cut a piece of MDF to the track's length and about 3 inches wide. Clamp the MDF to your table, perpendicular to the router plate, to use as a straight edge. This should be 2 to 3 inches away from the router plate.
Cut a dado to install the miter track, using your router and a 1/2-inch straight bit with collar. Cut out the dado in a series of small passes to create a groove for the miter track. This will give you the ability to attach fixtures or jigs to your router table.
Screw in the miter track, making sure it is flush with the tabletop.
Wax the laminate tabletop with a nonsilicon paste wax.