wood-filled rims are not typical.. (you are lucky to have found them !)
wood reinforcing was an old way of making a strong yet light rim, especially for the track..
i think some of the (still !) lightest rims ever were made this way
for dirtdrop:
i have seen plenty of cracks on non-eyletted rims so i would definitely recommend using washers with such
I have a pair if Weinmann tubulars that I think are a bit odd. No eylets and the nipple butts up on the inner aluminum wall. There is a wooden spacer between the inner and outer walls that keeps the nipple from pulling through under tension. When you glue up the rims, the glue goes on top of the nipples.
I don't have the most experience, is this typical set-up with rims without eyelets? Or is it something a little different?