BigBoss,
I'm fairly new to iClone and I have the ornate Castle package and I'm looking for the Pre-assemble Grand Hall, etc. All I see are the iProps. 

Good morning Milan. Unfortunately, this pack is provided as a worldbuilder with individual parts you can assemble to make different castles. Generally speaking, you can set the snap to grid option in your preference menu, adjust the grid size to fit the wall sections and it is fairly easy to build the structure.
I would provide you with the original scene if i had it but I do not have it as the pack originate from a third party.
Hope this helps.

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