The jet Spiderjet has is built somewhat differently than the one that Nitro has sent me. The internal bulkhead arrangement is different and there is more bracing on the gear mounts. Maybe not enough, but until the landing gear rips out, I'm going to try it as is.

I don't remember the exact measurement, but there's only about 7.5" length in the fuel compartment which is why I looked at the premade tanks.

Thanks for the offer on the CAD drawing but your picture is clear enough.