The Wicked Wench looks good.
For the plywood cracks, try cutting some of the excess plywood with a fine tooth saw and collect the saw dust. Mix it with some glue and use it to fill in the cracks after the part is installed. Fine sand paper can then be used to smooth the area. Using the saw dust from the same type of wood to make a filler usually helps the repair blend in better and take a stain more like the surrounding wood. Doesn't work all of the time but does work enough times to make it worth the try.
If you do not have a fine tooth saw sometimes agressive sanding on the scrap wood will generate enough wood dust to collect and use to make a filler.
