I put a detailed account of how I made the massive threaded bars for series 1 Pulsar on Facebook:
https://www.facebook.com/pg/teamrang...97292773908393
I wouldn't recommend using a drill to tap the holes (unless you're confident about the risks) - it's rather safer, if slower, to do them traditionally by hand - but otherwise this is exactly what you'd need to do, just at 200% scale!
I would suggest getting some quality taps as well. I don't know what the Aldi set is like, but cheap multi-packs are inevitably going to be quite low quality. A fellow builder was recently caught out by this; the really cheap specimens simply don't work. Some namebrand individual ones (you'll want M6x1.0, straight flute, hand taps) from pretty much anywhere should do nicely.
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