i currently use the orion 3200 lipo in my rb5. no fit issues too.
but have not tried a saddle pack lipo on the rb5 .. if i get the chance to try them then i will let you know.
jim has hit all valid points regarding the parts. the standard front & rear shock towers are unbelievably strong. don't underestimate them!
re weight - yes, was very surprised by its weight when used with LRP Sphere Comp, Spektrum RX, standard size servo, IB4200s, novak 13.5SS ... 1700g+!!
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