Hi Oscar
I,m following your build & enjoy seeing your progress, & as Johno has said...its looking great so don,t worry about lack of responses, keep cracking with the nice work you are doing
If in doubt on anything then ask away, the members on here are great & always help with constructive advice when requested or if something is seen that "might" not be right etc
With regard the bolts holding the roll bar.... I think its common practice from other builds going thru the IVA process that it appears most ( if not all ) testers like to see the 8.8 stamp on something so safety critical, said politely...your choice but for the sake of "peace of mind" I,ve used 16 bolts of 8.8 grade to secure my roll bar / back stays .
One question ....before you get too far into the build....are you intending fitting a GRP or ALI rear tub ? ( from the parts/plates that you have made yesterday) I presume you intend to fit an Ali tub?
Keep up the great work
AND...A huge CONGRATULATIONS on your Masters Degree, nice one .
cheers
andy