Welcome to Geekhack.
I too am fairly new here and also like the 1800 layout best and ended up buying a Drop Shift (low profile). And am currently working on building my own custom Cherry 1800. Ie. replacing the PCB and switches etc.
The easiest options for you currently would be to grab a pre-made keyboard like the Drop Shift or the Leopold FC980M (or C). I've heard good things about Leopold.
The Drop Shift suffers from a bit of ping, however after lubing my switches and tossing o-rings on each cap, it's pretty much removed the ping sound.
If you want to go custom by making your own PCB etc. Probably the most costly and difficult part is going to be the case. You could potentially have something 3D printed, however you're going to need to design the 3D model around the 1800 layout and to fit your PCB etc. There are a lot of things to think about and design for this approach.
There are a couple of github repo's available for 1800 layouts where you can grab the electrical CAD files and adjust them accordingly to customize to your liking. And there are very helpful tools such as kbfirmware.com and keyboard-layout-editor.com for setting up the layout and creating the firmware. You're going to need to know how to customize and layout PCB's as well as adjust electrical schematics in order to do this. Although KiCad is free and works great and is pretty easy to learn and there are a lot of tutorials out there for it.
There are also some tutorials out there for building your own custom keyboard from scratch which are helpful. But again, the case is going to be the most difficult thing to deal with unless you're able to find a case for the 1800 layout somewhere. Although I've looked all over and everything 1800 related is pretty much sold out.
You can find Leopold FC980M's on amazon.com but beware, the two main sellers of them on amazon have screwed me over and never sent me anything, later claiming they have no stock. Another person mentioned they can still be purchased from a Chinese website called Taobao, although the site is confusing to me.
Hopefully this info helps a bit.
Here is a link to the thread I started on the matter:
https://geekhack.org/index.php?topic=110247.0