G'day or should I say Kia ora bro',
I can't help you out with door panels unfortunately, but it was good to see a fellow Kiwi on the forum doing a '50 COE. I'd like to see some up to date pics of your Big Bolt if there available?
I have just completed a '50 COE in the past 12 months over here in Sydney. I thought you might like to take a look at it. Just highlight the link below and click on it.
I used a 1976 C30 chassis etc, power comes from a 500" Cadillac, 3speed TH400, 9" centre grafted into the C30 rear end. We used an Aussie built truck body for the dual cab graft - suicided the rare doors and a mid 70's XC Falcon station wagon roof section to fill out the roof area. I also grafted in a right hand drive '59 Chevy passenger car dash complete with Dakota Digital gauges and a Flaming River column.
I originally brought the cab out from Calif some 9 years ago and its been an 8 year build. The ride from the C30 chassis is unreal. It hit the road 12 months ago and at the moment it's my daily driver.
I waiting on a 1956 GMC 100 pickup to come in from Calif and I will use it for my daily driver if it checks out OK mechanically. I will use the COE on weekends and to tow the race car to the track.
The truck took out a Top Ten spot out of 506 Hotrods and Customs at a Rock & Roll - Show & Shine Festival over this past weekend. It certainly generated a lot of interest as it is the only road going COE here - although there are a couple under construction and others coming into the country.

I am from south Auckland originally but have lived in Oz now for the past 26 years- I'm 53 now and I am enjoying the nostalgia drag racing,hotrodding and rock & roll scene here.

As I said earlier, would love to see some up to date pics of your COE
Check out the pics of my cars and toys.
Look forward to hearing from you.
Talk to you later buddy.
Regards
Harry

http://www.flickr.com/photos/94367471@N07/