Thanks so much everyone!!!

Well, DH got home from work and as soon as he walked in the door I asked him for his help to do it so that we could start with the new sleeping arrangement tonight!!

We lined the cot mattress up with ours after taking off the side rail (adjustable side) off and DH drilled new holes in the cot so it matched up at the exact right level as our mattress. We moved our bed over so that it pressed the cot right into the corner of the room so DD's cot is next to the wall and we have loovers (sp?) window there with plenty of air flow so no probs there she'll get lovely air flow..... our bed is good in that the mattress pretty much lines up with the bed frame so all in all.... it works really well!!!
Oh and we rolled up a blanket and stuffed that down the side of the other side of the cot where the gap was (between side of cot and cot mattress) like you said you did Amethyst. (Dh did that then I read your post!)

We did our bedtime routine as per usual tonight and DD was excited rolling around on her 'new side' of the bed and seemed excited about it and fed and off to sleep she went - easy!! And hasn't woken in 3hrs!!

Fingers crossed for a nice sleep with plenty of space for us and noone kicking us in the head, legs, back or stomach!!!! haha! She's been waking up so much and gets upset cos' there isn't much room to move around and she loves moving all over the place so now she can in her own bed lol

Thanks all

ps why didn't we do this sooner? lol