Ok, I don't know how to do this, so it's informal,
but here goes...

First, 99% of credit goes to the original maker of
this map, Scott "Goose" McGregor. I added a few things and 
made it VCTF, so I get 1% anyway. :P

Installing: Just put the map in the map folder; no
other files are needed. I hope...

Description: This is an edited version of CTF-Grassyknoll,
which you should already have since the game includes
it. The changes are:
1. Added 2 tanks, a Hellbender and a Scorpion to
each base.
2. Added 2 respawning minigun turrets to each base.
3. Added a lightning gun and Avril next to each
flag, with ammo.
4. Added another pulse gun and 4 ammo for it to 
each base. (This is essental in vehicle maps.)
5. Built a top secret base behind the minefield.
There are the remains of an attack there. You still
can't get in, but there's a nice weapon there you
can get.
6. Removed some trees and things that were in the 
way of vehicle routes.
7. Yes, I botpathed for vehicles, and bots use them,
but it's pretty buggy.
8. Added a secret vehicle! What is it you ask? 
Examine the crashed vehicles at the minefield; one
does not belong. Where is it? You'll have to find 
out for yourself! Hint-If you simply wander the map,
you will never find it even if you literally look
everywhere. Also, there are two of them. I truly 
congratulate you if you find it without having to 
use the editor! 