Every major and most every tube junction has "tubular Gussets" 1" round x .120 DOM.. These tubular gussets are superior to those little stitch welded plates. I have gussets at many more places than the rules require
Just one of 20 + gussets as an example.
Jim Miller has seen the chassis pics and said all is OK,,, As to lateral movement rules,My containment seat is made of mostly .250 thick alum, (vs .100 to .125 for your average race seat material) also with SFI cert "lateral head and shoulder supports" (far superior to many seats I have seen in use) ,,, I am also sitting at / behind the "B" pillar,,, also have a "full" door net too.
These twp pics are just showing the initial test fit of the seat, more bracing, brakets and cage tube has been added to keep the seat in place. (and me in the seat too)
As and extra precaution, I asked about the 4 plates per side flat gussets vs my 20 +/- tubular gussets,,, before I started, So I hope the email and the phone conversations and my build diary notes and posts, I have had with Kiwi Steve and Jim M are enough.
Additionally, I have consulted Joe Timney and Keith Turk (as to ECTA / LTA rules as well)
I am not trying to reinvent the gusset equation, but felt the tubular ones provide a bit of structural and crush strength, complimenting the main larger 1 3/4 tubes, not just the added protection tothe weld joint as a plate gusset is designed for.
I could be wrong, but don't see how the abundance of these tubular gussets can't be better ?
Testing shoulder restraint fit, before we install the Head Restraint.
.
Charles