Yes, rand (min, max) works for giving random value but the distance between every 2 blocks can't be randomised by it, there must be some other way or something I'm missing completely

facing hardship with 2 things, it will be awesome if anyone can help

first problem:
made a box
to copy node, 6 copies
to move node, moved some distance
now, i have something line this:
■ ■ ■ ■ ■ ■
how do i make a solid group of all these copies?

another problem:
is there a way to randomly move copied opjects between a set range (distance between 2 boxes can be anything from 3 to 10, random distance between every copy)? if yes, how?

eg:
instead of getting
{■ ■ ■ ■ ■ ■},

how can i get
{■ ■ ■■ ■ ■}

Need help here, how to do it in SketchUp?

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I have to make those snake skin like things, any idea how to do it?