The window bounds are a list of coordinates {left, top, right, bottom}. You probably intended "400" to be the width, but it's the position of the right edge of the window and 400 is to the left of 1105, so you get a minimum width window. Change 400 to 1105 plus the desired width, e.g., 1505.
But before you pursue this further, Terminal has a better solution for this: Window Groups. If you set up a group of windows and save them as a Window Group, each time you open that group it will create windows with the same layout and appearance.
Window > Save Windows as Group…
You can even tell Terminal to open a selected window group at startup:
Terminal > Preferences > Startup > On startup, open: > Window group:
(As a shortcut, when creating a window group there's a checkbox for making it the startup group.)
To automatically run particular commands in those windows, you can create custom settings profiles and specify the command with
Terminal > Preferences > Settings > [profile] > Shell > Startup > Run command:
then create each window with the appropriate profile.
Going further, in Mac OS X Lion 10.7 you can have window groups automatically restore commands without creating custom profiles, by creating the terminals using
Shell > New Command
instead of running the command inside the terminal shell. When creating the window group, you can check "Restore all commands". (By default, it will restore a small set of "safe" commands, but you must explicitly tell it if you want it to re-run all commands when opening the group.)
Moreover, Lion Terminal supports Resume and will automatically restore all your windows each time you open Terminal. It will even restore "safe" commands for terminals created with New Command.
Well, these commands edit .plist files in your /Users/xyz/Library/Preferences folder. So, if you look at these files, you can look at these files and base your Terminal commands after these.
These are XML-based files, so you can view them in a more readable format if you open them in Xcode, which is available in the Mac App Store.
In the Terminal, the format for these is "defaults write PLIST_FILE KEY -TYPE VALUE"
where the PLIST_FILE is the name of the file in the Preferences folder without the .plist, KEY is the key that you can see in Xcode, -TYPE is the type of key that you can find Xcode (and you can find if there is an abbreviation for that type by typing "defaults" into the terminal), and value is the value you wish to set the key at.
Here are some of the string types from the Terminal:
-string <string_value>
-data <hex_digits>
-int[eger] <integer_value>
-float <floating-point_value>
-bool[ean] (true | false | yes | no)
-date <date_rep>
-array <value1> <value2> ...
-array-add <value1> <value2> ...
-dict <key1> <value1> <key2> <value2> ...
-dict-add <key1> <value1> ...
Best Answer
In Script Editor you can reference the Dictionary:
Open Script Editor, navigate to File > Open Dictionary... Choose The Terminal.app
When you click Terminal Suite you can see a list of classes:
If you wanted to get deeper in AppleScript you could buy the application Script Debugger version 7, but as noted in the comment there is a free version which is Script Debugger Lite if I recall. It appears to have an extensive library and utilizes a tree structure separation that helps filter through what you might want. The referenced image is from Script Debugger 6.