i've only had a split line once, and i saw it right away, but i cant see the tank, and IF i ever had a problem i'd like to be able to quickly drain the fuel and not worry than wonder what i'm gonna do next and if it's ever flyable again. for a few seconds splashing about with a brush it's worth it. Plus my planes hopefully last a LONG! time, so any fuel ingress is a bad thing ( just ask my Outlaw, half of which is sitting in a bag of cat litter as i type). Selling on your fuel soaked planes after a year, tut tut tut Archie
i've never built a plane where i can't get at the tank, even changed a few designs so i can

T-nuts.. push them the back in a fraction, the mount has been spot glued to the firewall, do up the screws to pull the nuts in. weirdly i didn't see the mount pushed off the firewall, but when i took it off to check it was straight there was my problem hidden from view. First time i've ever seen that.

Balsa selection.. Malc said get hard balsa, or even better bass. couldn't get bass.
what i had was called "hard balsa", but the aileron stock i had felt harder. i considered swapping them over and building the ailerons from the 1/4x1/4. but when i called Malc ( who didn't know it wasn't what he calls hard balsa ) he said the ailerons needed the 3/8thx1/4 and the 1/4x1/4 spars would be more than strong enough. More than strong enough sounds good enough to me eps coming from a design master, and as i was building a proto i thought it was only right to build it as desired and not go swapping bits over.
At this point i wish i had gone to Truro and got bass ( not that they have any either )

but, if it hadn't have snapped you would now be using hard balsa with orginial spar layout, and theres a chance that would snap, so the choice to go with bass and change the rear spar is the exact thing my ****up saved you from.
Would rather still have my orginial fuz in one bit seeing as i'd just finished it and loved flying it so much, but if the redesign saves a few other Capiches it was a worthy loss.