Hey,. Good choose on deciding to build your own 
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The zmr250 is a fairly popular kit but the one sell for Ā£75 is aimed at beginners so flies more like the runner 250 compared to the vendetta which is quite powerful.
As for building it we have a full zmr250 build guide - QAV ZMR 250 Assembly Build Guide
And if you have any questions about the kit just let me know. And any problems building just as on the guide 