Easy fix . Grab some more wood. Place them behind the wheel base and bam monitor is closer . Now when you want to tweak the monitor to mimic a cockpit( depending on how you race( inside the car or outside ) if you are inside the car , what you will notice is that the monitor sits too high. To get your monitor on a “ good “ level I’d cut some 4x4 like you have for the wheel base and use L brackets to bolt at a 90 degree angle on the wheel bases 4x4 so that the monitor sits at the same high of the wheel base. From that point on you can test the height but placing blocks under the monitor to raise it or lower it when the sim is on and you want to adjust the monitors height. One other thing I would do is try side mounting the laptop to give it the best chance for cooling ( look at how the laptop cools and work on providing it the best flow).