Start from cubic forms inside Rocket 3F if you are not enought satisfied by the SubDive tools yet existing of MOi! ;)
(_SBridge, _sSplit, _Sscale, by Max SMirnov) + Extrude...
About SubDivide in nurbs :) https://moi3d.com/forum/index.php?webtag=MOI&msg=9689.1

Here random selection inside Rocket 3F