Welcome!
Do you know what manufacturer / model chassis (frame) you have bought? £200 is ridiculous money for a complete kart, in a good sense of course.
I don't think pro-kart frames are made of any other tubing other than steel (excluding welding / brazing differences)? Maybe someone else can comment if any manufacturer uses an alloy of some description.
So you'll probably find the frame you have isn't all that heavy compared to newer frames.
Also, if you change the frame, you'll almost definitely have to change the front stub axles, which could lead to different rims. Other components may also need to changing such as front, side and rear bumper bars, floor tray and then there are the axle bearing carriers, will they be compatible? The list will go on, naturally.
So, in short, there is a bit to think about and in the long run is not a cost efficient way about things.
If you're happy with the engines but iffy with the rolling chassis (complete kart, minus engines), then consider buying a newer rolling chassis. I bet there are a few good MS Kart / 7Kart / Wright rollers knocking about, just hop on eBay. They would be pretty competitive too provided your engines pull well enough.
My advice though, stick with what you have for the short term at least, get it running and get down to the track on it. Even if its only for a few sessions, you'll soon get the taste for karting and begin to 'learn the trade'. Best to do it on an older chassis that you have not invested too much money into.
Hope that helps!
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