The rules are contained within the blue book (karting Technical regulations starts page 353) which describes materials, sizes and construction limits.
eg: Chassis must be of magnetic steel, one piece and welded or brazed.
there must be no form of chassis control involving pivots, dampers or similar devices etc.
The final hurdle is that it must satisfy scrutineers that it is going to be safe at the speeds and conditions it is likely to encounter.
(You need to have some idea of the loads that a crash can impose. You wont have happy customers if you are as quick as lightning, but the chassis bends if it touches another kart or is scrap if it goes into a tyre wall.)
Some classes and some events demand a homologated chassis that has been through the appropriate process (KF1 & 2(CIK) and TKM for example)
The Gold Book states that Rotax chassis have to comply with MSA Technical Regulations. But you might need to watch reg 122 (only holes drilled in accordance with manufacturer's homologation or Official replacement parts list) which implies there might be more hoops to jump through.
An aircraft licensed welder ought to be able to produce a good enough weld for single test karts, but you need to consider how you will consistently produce more than one. The jigs and tooling can work out more expensive than you think.
On a forum note, half your post is an advert for the services of a supplier, and nothing to do with the building of your kart. (The forum doesn't 'do' adverts.)
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