So I decided to try and see what the actual size of a one-block would translate to in real units. Using the game's measurement system, specifically the mission readout, which measures in meters, to the whole, I was able to get an estimate for the size.
Using one of the Crafty Mike missions, as the mission waypoint can be traced to a single block, and the waypoint doesn't move, I was able to conduct a few experiments.
Attempt #1:


As shown in the first image, the red line denotes the actual distance, from the center of the cab, to the center of Mike's base, the origin of the waypoint, which is about the size of one block. The green line is a reference, showing the length of two blocks. Using the measurement of 1 meter (3.28 ft) that the games gives us, it shows a rough size estimate to start with.
Follow-Up:


The two images above feature the second attempt of finding out the size of a block, featuring a distance of two blocks between the center of the cab and the waypoint. The mission readout states that this two block distance is equal to 2 meters (6.56 ft), which gives us a pretty good idea of the size of a block.
Conclusion:
Due to the consistent block length readout about of 1 meter (3.28 ft), and due to the block's status as a cube, we can assume that the total size of a single block is around 1x1x1 meters, or 1 meters cubed, which is about 35.29 feet cubed.
Closing Thoughts/Ideas:
Going off of the size estimate, and the average human height of about 1.7 meters, its pretty accurate to assume that the GSO cab featured here would be quite cramped, allowing the person inside to only sit down, forcing them to crouch if they stand up.
Also, since the max size a tech can be is about 64 blocks cubed, it translates to about 64 meters cubed, or 209.97 feet cubed.
Now that I know this, I wonder what it would be like to see a tech in real life. It would probably be quite intimidating, to be honest.
Using one of the Crafty Mike missions, as the mission waypoint can be traced to a single block, and the waypoint doesn't move, I was able to conduct a few experiments.
Attempt #1:


As shown in the first image, the red line denotes the actual distance, from the center of the cab, to the center of Mike's base, the origin of the waypoint, which is about the size of one block. The green line is a reference, showing the length of two blocks. Using the measurement of 1 meter (3.28 ft) that the games gives us, it shows a rough size estimate to start with.
Follow-Up:


The two images above feature the second attempt of finding out the size of a block, featuring a distance of two blocks between the center of the cab and the waypoint. The mission readout states that this two block distance is equal to 2 meters (6.56 ft), which gives us a pretty good idea of the size of a block.
Conclusion:
Due to the consistent block length readout about of 1 meter (3.28 ft), and due to the block's status as a cube, we can assume that the total size of a single block is around 1x1x1 meters, or 1 meters cubed, which is about 35.29 feet cubed.
Closing Thoughts/Ideas:
Going off of the size estimate, and the average human height of about 1.7 meters, its pretty accurate to assume that the GSO cab featured here would be quite cramped, allowing the person inside to only sit down, forcing them to crouch if they stand up.
Also, since the max size a tech can be is about 64 blocks cubed, it translates to about 64 meters cubed, or 209.97 feet cubed.
Now that I know this, I wonder what it would be like to see a tech in real life. It would probably be quite intimidating, to be honest.