Alex,
Looks like its taking shape nicely - I sympathise with you on the hand sawing!
I'm a glutten for punishment and think its sometimes simpler doing it this way (but its not). There is no power to my obs yet so I'm too lazy to drag the power cable from the house - which leaves me three rusty saws to choose from - Ahh I only have myself to blame.
Good luck with yours - I'm sure it will be perfect.
Anth