There's nothing overly complicated about building and 1/8th car over 1/10th.
Follow the manual regarding ensuring parts are free.
Remember to grease all the moving parts of the diffs and you'll be fine.
The only thing I'd suggest is not to trim the throttle/brake linkages until after the servos and engine are in, then you can cut them down (if necessary) and neaten everything up and likewise the exhaust mounting wire.
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