Is any facet modifications must be done? Like, moving landing gear little back or so. How i have to do that? Replacing whole landing gear or , just have to moved back or somethink else. And any other kind modifications? Please let me know. Thanks.

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Build it like the instructions say, put the gear right where it's indicated on the plans, and you'll have an EXCELLENT flying plane...(I've flown two of them...and I'm still happy with them...)

Greg