Don't take it personally Ian, please

Just carry on doing what you are doing and waving the banner
One of the contemporary problems seems to stem not so much from the replica chassis debate - IMHO if it looks period and has been built using appropriate materials and parts then that is OK, as stated in the original CRMC sidecar spec, which incidentally I was instrumental in creating (dons flak jacket, tin helmet and Nomex underwear).
Engines are big bone of contention, not those that are strictly as per original specs within period but those that have evolved since that time. The door that was opened that let 'big' engines in was the silhouette rule, that if it looked a Commando or A65 externally then that's what it is. No matter what goes inside and what goes on inside it's an A65 etc. This rule was largely bought about due to concerns of the members who were running genuine ex-GP machinery, Manxes, 7Rs/G50s etc about parts and materials . To help keep machines on the track it was decided that this was OK. So then you could run, in theory at least a 750cc Manx with all titanium internals, electronic ignition hidden in a magneto etc etc. Anyone spot a potential problem here perhaps?
So folk started to try and push the rules to their own agendas, parts and or mods that were not strictly period but were for 'safety' concerns to some extent as well as the never ending quest for quicker engines. It was well known in the early 80s that there were some very large non-standard unit BSA and Commando engines running in both solo and sidecar classes but nobody ever protested officially. How to spot them? Easy, just listen along the back straight at Snetterton , for example, to the engine revs. A non-bored and/or stroked motor would be revving far higher than their bigger counterparts. IIRC rightly there were very few ever used in period racing although the grasstrack boys particularly latterly used indecently large Triumphs and Nortons. So you can see the evolutionary path in CRMC perhaps. A case of maybe give an inch and take a mile ...
With the perfect gift of hindsight perhaps the initial decisions to allow certain things was not in the best interests of the Club. Perhaps the eligibility bods were too flexible or were unable to see where certain decisions might lead. All conjecture perhaps ...
Unfortunately, some say, in the CRMC GP solo classes this has led to exceptional development in the Manx and AMC machines, so much so that well tuned ex Petty/Dearden machine is no match for them. To some extent the silhouette problem and that of development,big bores etc also was partially responsible for the creation of IHRO because of the purity of the breeds being diluted. Do we see a similar parallel in sidecar racing thus? I leave that for you, the reader, to decide and discuss...
It is true about the sidecar family - you can stop racing but you can never, ever leave!