Well, it is finally time for me to go with the times and get me a 4x5 rig.
Unfortunately, buying one overseas would most likely bankrupt me and the local aftermarket consists only of Feds, Zorkis and Zenits sold at the price of their own weight in Californium (google it) as they are considered relics from the Soviet occupation that so many people fancy.
But not to worry, I have 2 hands (contrary to popular belief that only radioactive mutants live in this corner of the world) and some basic skills how to bludgeon things together, so let's get started!

For the principle design I have chosen some creepy crossover from those grotesque 1910's quarter-plate folders and the venerable Speed/Crown Graphic. Mainly because I have parts from these two.
The current progress is that I have a lens - nothing special, a Tominon 135mm but it is nicely shuttered and the cell is easily removable so I am tempted to look up that nice machinist I helped many years ago when I had a summer job at a machine shop and get some suitable adapters made for two nice barrel lenses I own for a bottle of vodka and voila! A lens system!
I also have really stunning bellows - 4x5 Crown Graphic ones, donated by a kind gentleman over here. If you are reading this then again, thank you!
On the table beside me is a stack of film holders, ready for their first task and a box of misc. parts I salvaged from a disintegrating plate camera; my main interest in this box is the "railway" that I will probably use in the build but as it is quite worn out and would be needing replacing in the coming years, I am keeping my beady little eyes open for something more suitable, as well as for a spring back. But if I can't get my hands on neither of those, I will improvise. For the back one could just make a simple frame and line it with felt or other suitable light trap material. One could also cut a small groove in the base of the frame to devise further light trap and a place for the ridge on the film holder to lock into. One could use perhaps a bar held in place with strong magnets to keep the holder locked in.
For the front standard and lensboard I am going to use almost identical design that I used with my previous build, depicted here: https://www.flickr.com/photos/moribundworld/8962444804/
For the body I have found something labelled as DIY-Board at the hardware store; basically a spruce edge-glued board. Not the prettiest but it is easy to cut and machine and it is extremely cheap. People do a lot of shelving out of these around here. The body will be quite bulky since the lens is relatively long, the total thickness of the camera would be around 10-12cm but I can cope with that, I don't mind. Simpler to lug around than a monorail, quicker too, although my medium format monorail is pretty quick if I want it to be, even got a candid shot with it.

I will continue to ponder on about the design and source essential parts. I am also open to suggestions and so on.
It will not be the prettiest camera ever built, nor will it have the most generous movements but think it as a means for a young person to start shooting LF.
So stay tuned for more updates!