I currently have my bike in bits, and going away for 1 month 

I've got a scooter with an engine issue sitting on the backburner. Motor reg contacted me to surrender the plates when the reg lapsed. It was an easy matter to phone in and give them an idea how long the build was going to take. I told em about a year and he said he would note it on the file. I think if you let it lapse over 3 months, you'd pay for a further period of reg plus probably an "admin" fee

Stopped reading at "does the rego department allow a bloke to save a few dollars..."

It's a system where if the bike has been registered in the ACT before, you can let it lapse for up to 12 months and still be able to re-register without dramas. Had a mate who 'chose' not to ride during winter, so the bike went into hibernation. 

Looks like its a trip to Rego office I'll post the result 

Not being a smart arse but with some of the "modifications" you have posted about here that you have done, I would keep it registered even if it costs you a bit more in the long run ??