The first one doesn't require a CMS, you're looking for, like you said, a Materia System. Googled it and found this:
Materia System by DustCollecter.
In Scene_Menu, on line 25, add an extra line and add
and from
@command_window = Window_Command.new(160, [s1, s2, s3, s4, s5, s6])
make it
@command_window = Window_Command.new(160, [s1, s2, s3, s4, s5, s6, s7])
on line 161 (162, if you already added the s7 in the beginning), where it says
when 5 # end game
# Play decision SE
$game_system.se_play($data_system.decision_se)
# Switch to end game screen
$scene = Scene_End.new
end
Before that last end, add
when 6
$game_system.se_play($data_system.decision_se)
$scene = Scene_MateriaEquip.new
so now it should look like this:
when 5 # end game
# Play decision SE
$game_system.se_play($data_system.decision_se)
# Switch to end game screen
$scene = Scene_End.new
when 6
$game_system.se_play($data_system.decision_se
$scene = Scene_MateriaEquip.new
end
Now you can access that Materia script from the menu.
Also, the Materia script comes with SDK. Any line that has the word SDK in it, remove the entire line. It's not required and the SDK blows.
The second request, sounds like an Alchemy System to me. There are some out there, none have really worked for me. I'll search later.
The third, not sure what you mean exactly.
EDIT: Not sure if it looks similar to FFVII. Never played it. Google Image searched it, it doesn't look like it, but you can easily change the XY positions, width/height and make it relatively similar.