That would be a tough one to find. LWS made short run kits, maybe only 25 or 30 or so, some based on orders received after seeing them offered in the LWS newsletter. It did usually show a completed (but not necessarily painted and lettered) model.
How many of the car and loco kits sold that were ever built was always a mystery, since very few photos of completed LWS models got published. LWS dates from the period before the internet became widely used.
LWS kits can seem difficult to build, but with those I've worked on, everything was there. When LWS was still in business, missing parts or any that got damaged while working on the model were easily replaced by asking.
However. LWS instruction sheets were not all that easy to follow or detailed. To build an LWS kit, one had to be fairly proficient in how a brass model is put together.
Prototype photos for the model are a huge help, as is carefully going though all the parts, laying them out in some semblance of an ''exploded" model to see where they all go together. Tagging or marking parts will also help.
When building the LWS caboose, you will need to plan ahead to determine how the car will be detailed. It could be done with either the roof or the floor made to be removeable. However for a brass car I'd opt for a removeable floor and underframe. That way the roof soldered top the sides and ends will keep the body stable.
Here are three LWS locos I worked on, built from kits. I've not built any of the LWS brass car kits, LWS also for a while produced the former Athearn line of O scale 40' and 50' boxcar kits. LWS production ended when the owner, Jan Lorenzen, passed way several years ago.
This kit was produced with a minimal under frame. One had to be built according to how the loco would be powered. I built this one for a friend. It as two 9000 series Pittman motors with Central Locomotive Works transmissions for each truck. Both ends have an articulated draft gear which enabled it to handle cars on a 72" radius.
Done in 1985, it has constant/directional head and class lights as well as a working strobe light on the cab roof. It rolled a 60 car O scale freight at a scale 65 MPH. when tested on a large layout.
Unlike the UP loco, this ALCo DL-109 was a cast resin body kit with trucks. no floor or underframe. I outfitted this model in 1987 (also built for my friend), with an All Nation drive and a Pittman 9000 series motor. It has a .030" thick sheet brass floor, built up underframe using Special Shapes channel and I beams. It also has extra weights installed. On a test, it hauled an 8 car passenger train at about a scale 65 MPH.
This 0-6-0 camelback is mine, built from the LWS "economy 0-6-0" kit of 1989. It was extensively modified, altering the frame to change the driver spacing. A new boiler was made from a brass kitchen sink tailpiece. The tender is scratch built in brass. It's powered with the "Holland" can motor LWS provided along with LWS gearing of a fiber main axle gear and steel worm. It is outfitted with an on board 9V battery powered sound unit synchronized with the drivers, as well as constant directional headlights. It can haul a 15 car freight at about a scale 35 MPH, about as fast as its prototype ever ran.