I had fun doing this! thank you for the good lessons!..^.^
I’m just having a hard time using the (Object>Apply) transforms, I always ending up transforming two sides of an object.
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Welcome, great hard surface model! I like the first one, more to see!
Most students have troubles with scale and the need to apply.
Try to remember, in which mode am I working now!
And check sometimes your scaling properties and correct it.
Do you use the mirror modifier?
Have fun!
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Very nice tank. Is it wise letting Suzanne drive it! 
Welcome to this site.
The object should not alter on Applying. Unless you were using a modifier before you applied the rotation/scale.
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Thanks!
I just made this with object mode and primitive shapes.
I don’t know how to use mirror modifiers yet, that maybe what I was looking for since I had some trouble making both sides symmetrical like the wheels where I had to re-allign everything using viewport shading.^^
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Thank you!. 
Ohh, I see, I’m still having trouble using object modifier/ctrl A…
I really have to make use of it more to make myself get used to using that tool. 