If you're going all future-fantasy land..You might want to take a look at some of the builds a guy in the UK (or US?) did. I think he was called Candyman. He used 249 mechboxes and PVC piping I think.
Let me look
Not him...but neat stuff...http://www.ukmonsters.co.uk/oldmadwe...ics/wa2000.htm
This is the guy...he's built some pretty wild stuff and has plans posted for public consumption. I don't think he has kits...I know lots of guys were asking for them long ago.