Just to throw my hat in the ring, Miniart, Dragon, and RFM have this cutout in the fuel tank. I simply find it interesting that the 234 variants offered by these companies have this cutout. This doesn’t prove anything, they may have just copied Dragon, but it’s worth noting.
Can you provide us with photos of the fuel tank from your research? I can’t seem to find any of the fuel tank from any 234 variant. However, that’s just with a Google search, if I had access to the nuts and bolts book I would take a look at that.
BTW, I wasn’t sure that RFM had the cutout, but AHHQ has released an open box review of the kit for those who are interested.
Edit: Please don’t feel like we’re jumping on your case, we’re (at least I am) just after evidence and such. Statements without evidence behind them spark doubt, and, since you are new here, no one can back up your credibility. Again, I’m not saying that you’re lying or anything, just that evidence helps.