Never fly without. Have a few, bot smart-fly and RCXL. Main concern was if the ignition could cause damage to the powerbox, but after reading this and the other site I'll give it a go
how old is the ignition? if it's very old and therefore probably more likely to emit rf noise it still might not be such a great idea. newer ignitions with newer receivers don't seem to have the same problems anymore.
If you would, post some pics of the Carf. I was just flying my 11 year old 90" Carf 330L today. It still flies great! I also flew a brand new Carf 330SC with a DA120 today, it was a sweet flying airplane.
Are you going to do a build thread here? I'm sure a lot of people would be interested.And after Saturday I'm starting the build of an EMHW 50 % Challenger