Hi Marc.
Sorry can’t help you with the Basra beast but as for the Operation Telic Chally I built the Tamiya kit and I think it is a very reasonable representation. My build was completely OOB but I’m sure it could be improved with aftermarket bits and bobs. I have also built the non TES RFM Chally and they are very similar in general detail and proportions.
Op Telic Tamiya
Side by side with RFM.