Sankei is a Japanese manufacturer of laser-cut buildings in Z so far only available through Japanese dealers on Ebay. Rather simple build kits with a combination of laser-cut and printed paper panels Sankei is devoted to Japanese buildings only including residential and commercial.

Simple kits with simple instructions bordering on just okay materials. For meticulous modelers who take their time these buildings turn out okay, but there is no room for sloppy as mistakes will be obvious and distracting. Printed roof tiling may not be for everyone but you can probably change this out with leftover materials from another kit (?) which will greatly improve things.

This post concerns a highly rated tunnel portal sold in pairs of red and natural. Made of quality heavy card-stock this is one of the better tunnel entrances that I have seen. It seems to only come in one size for a single track. Put a reverse loop in your layout and use both portals. There is flexibility with establishing the angle of the wings projecting either slightly or a lot, they are simply glued in place.