Converting a unit?

[Koopa124]

There is a "Packed up" version, [Mobile] and an "Unpacked" version [for attacking] of a unit I have called the Trebuchet.
When you go to "deploy" the trebuchet, after X seconds, it converts to an Unpacked version, is their a good way of doing this? Right now I just have "wait X seconds, replace unit with "trebuchet unpacked" but sometimes it doesn't work, and sometimes you spawn 2 trebuchets instead. So I could use some help/

 

[ap0calypse]

Perhaps you could use an ability based off Morph (illidan / druid) with a channeling time?

 

[Koopa124]

It requires units inside it (Load [Seige])

 

[ap0calypse]

...what?

 

[Koopa124]

It required units to be inside it, since it's a trebuchet, people need to operate it.

 

[ap0calypse]

this should do it (just tested it, it worked)

• Trebuchet
  • Events
    • Unit - A unit Begins casting an ability
  • Conditions
    • (Ability being cast) Equal to Unpack
  • Actions
    • Set TempGroup = (Units owned by (Owner of (Triggering unit)) matching ((((Matching unit) is loaded into (Triggering unit)) Equal to True) and ((Unit-type of (Matching unit)) Equal to Worker)))
    • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
      • If - Conditions
        • (Number of units in TempGroup) Equal to 4
      • Then - Actions
      • Else - Actions
        • Unit - Order (Triggering unit) to Stop
        • Unit - Order (Triggering unit) to Night Elf Druid Of The Claw - Night Elf Form
        • Unit - Order (Triggering unit) to Stop
    • Custom script: call DestroyGroup(udg_TempGroup)

(don't mind the stops at the end... it's needed).
Combine this trigger with the regular bear form (but uncheck the "uninterruptable").