Hi recently been offfered a Shetland Vimar 504 not knowing anything about them i bought it anyway.I haven't had a chance to put it in the water yet so can't really say what i think of it..I read afew threads saying that there not bad little boats .Can anyone give me any info on them plus would i be correct in thinking that the hole in the back is suppose to be there to let water in while not moving to keep it stable then drains while under power..similar to a rib......