Can somebody give me a description of Jim and Huck's raft in The Adventures of Huckleberry Finn?

The section of this great novel that you want to look at
is Chapter Twelve, which describes how Jim and Huck fled the island and the people eager
to earn some money by capturing Jim, the runaway slave. As they make their way
downstream, we are told that Jim used some fo the top planks of the raft to build a
wigwam for protection from the elements. He made a floor for the wigwam and raised it so
that everything would remain dry from waves coming from other boats. Because of Jim's
ingenuity, they could have a fire on the raft that could be hidden. They made an extra
oar and also "fixed up" a short stick on which they could hang a lantern to advise other
ships of their presence.

In Chapter Nine we are given the
measurements of the raft. Note what Huck tells us about
it:

One night
we catched a little section of a lumber raft--nice pine planks. It was twelve foot wide
and about fifteen or sixteen foot long, and the top stood above water six or seven
inches--a solid, level
floor.

Hopefully these two
descriptions of the raft will help you imagine how Jim and Huck lived on it for so long,
and how it became their home.