Thank you huck!
Pictures will follow as the work continue, but becasu i dont have much time is most of the work done for the weekend. As for motor i hade some discussions with some guys who has boats in my country. I have decided for this motor :

<a href="http://www.hobbyking.com/hobbyking/store/__14400__Turnigy_G32_Brushless_Outrunner_770kv_.ht ml" target="_blank" rel="nofollow" style="color: rgb(0, 148, 252); text-decoration: none; font-family: arial, helvetica, sans-serif; font-size: 15px; ">http://www.hobbyking.com/hobbyking/s...er_770kv_.html
</a>
it should bee enough..
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