Plans for a CR from sweden. Please help

Hello I'll give i try on the english speeking site. i have a basement room that i would like to have a CR in. The existing walls are of concrete and it is 1.8 meters underground I'll pass on a swedish plan but i'll try to translate. the room is 5.3meter * 3.9meters with a celingheight of 2.25 meters i can only build in the left part of the room and 2.9 meters to the right because of plumbings and stuff. otherwise the celing would be extreamly low. the door is on the low right and there are no windows to care about Hope you could make a nice plan. I think I know how to build. I just need to a good plan. First priority is a CR. if you can fit in a songbooth thats good but not necceserry. I want the best sound bossible in CR. I have looked and searched in the forum. But I have troubles with your feet and inches =D. Ask if something is unclear. I'll will not be able to answear from sunday night to friday night because of the military service I do, but please post som plans

Your room is almost the same size as mine. My door is on the opposite side. I saw a good plan from John that overcomes the problem of back corner traps so I will pass is on to you. If you have questions maybe you can ask John. Ignore the window if you don't need it. Al Palmquist (but I can't speak Swedish)