Only just had the chance to read pages 3-25 of this thread. I started a while ago, before it hit facebook or twitter in fact, and then assignments took over my life!
All I can say is wow. Leon you are an inspiration to all of us. Sounds properly cheesy but it's true. The way you have handled yourself throughout is absolutely incredible. You've remained calm, kept your dignity and generally done everything you could have done for the sake of your family, and most importantly of all, it's come good!!
You have no worries about parenting, from everything you've said here you are the best father any child could want. I have a friend who has muscular dystrophy (or something similar, needs to wear splints to walk) and appreciate how hard basic things can be. Having said that, with our explorer scout group at easter, she hiked 15km across dartmoor over 3 days, 10 of those on one day! I guess the point is the condition doesn't prevent you from being great.
I hope that the donations collected here give the kids the best possible Christmas they could imagine, and of course that you find time to treat yourself and enjoy it, even though by the sounds of you, the greatest possible pleasure will be seeing them happy. Fortunately the kind gifts of parts mean that you will be forced to have a present for yourself!!
This just goes to show that whatever people think, the community spirit is well and truly alive, along with the Christmas spirit, in the hearts and minds of this forum at least!
Merry Christmas mate, you deserve it.