I donīt think you have to worry about the car being to heavy when running LiPo. 1800 grams on a 501X is with Nimh cells. The 501X is not that much heavier than the 511.
My 511 weigh 1628 grams with IB4200 lipo, diff cover (10 grams) and lipo cradle (8 grams). If you add the 501X arms you add another 8 grams to that. Nothing to worry about.
The 511 is much easier to work on than the 501X. You can fit LiPos on the 511, just as you wrote. Filing, shorter screws and raise the posts.
Migs, if you need a diff cover just let me know. Same goes for the LiPo cradle.
The main reason I no longer have them om ebay etc. is that it cost to much to sell them with all the ebay and paypal fees.
I sold them as cheap as I could without any real profit just to help other 511/501X drivers.
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