Came across this
photo of 69808. Are you going to model the kink in the front valance or have ACE done that for you...?
Looking at the bunker there appears to be a seam halfway down, however on enlargement it appears to be a mark on the slide.
Another
photo of 69808 here and
here - again, looking at the handrail it appears you could build the kit from the box without any modification
.
(apologies if you already have copies of these).