Ok again in case anyones interested
here a template file. TO be used with Empty file earlier.

cut and paste each object as many times as you like, and fill in the ?? fields

remeber + is to the right in X direcrion
and + is DOWN in the Y direction, so nearly all Y co-ords are -ve


for the Empty file
Put your first bird about x =-15 y = -0.2

and all your structure about x = 40 + ish


spritepivot defines the size of blocks. so you know there relative size.

angle defines orientation of the object blocks are horizontal for 0 or 3 and vertical for 1.5 or -1.5

definition field defines the object,
and none of the Sprite values seem to have any effect, nor does levelGoal seem to have any effect.

UPDATE
In fact changing the definition block of the light, wood , stone type
changed the block stats, so it looks quite easy to swap block types.
just need to change 1 field

I tested this by putting a light plock up and threw red birds at it
light clock - 1 hit
wood and stone - 2 hits (but i think the wooden ones can hit the edge where as stom might need more middle hits)


UPDATE 2
The object x,y co0ord is to the middle of the object (i was assuming bottom left DOH)

For static block 04. the x and y should be +- 4.5 to be flush

medium pig should be +y 1.9 to sit on top of an object.