You will be alright. The biggest welding problem is not leaving pinprick sized holes in places so air can get in. There was someone that did actually make them, but that was probably 15 years ago, and I haven’t seen them around since. I think they were in kansas or missouri.
You can also adapt the design to stationary power, in which case @Matt
owns https://www.thriveoffgrid.net/ and builds them and ships around the world. In theory, you could charge an electric vehicle with them, but I am guessing you may not like the idea of an electric vehicle though.
He has his own thread on this forum.
At the very least it will give you a different perspective on what is possible.
If you are wanting to drive across the country especially in a SHTF scenario you may want to be familiar with both techs. Most people start with a charcoal gasifier because it is cheap and easy. You can convert a small engine fairly quickly, and charcoal is easy to make. It is also ends up to have a higher fuel density, because the char process removes water, ash and a lot of the tars. it is easy to crush and then screen to size. You can convert a small engine easily in a weekend to get started.
If you are looking for Africa, then you might take a closer look at combining it with solar into a more of a microgrid/offgrid solution. Less work is required, and the cost of solar has plummeted so it can pay back in 7-12 years in most of the US and probably even faster in africa because they use a lot of diesel generation which is more expensive. It doesn’t help for driving unless you have the EV which some parts of africa do have a few and like the Wuling mini-ev is starting to be sold there.
In our state, all building contractors are required to keep refuse like recycleable building materials ie wood out of the dump. So you may find a way to save money.
You can do a WK style, I am not trying to dissuade you. i just want you to be successful. Knowing 50 ways to skin a cat will allow you to adopt various parts that work for you. There is no wrong way. Everyone’s situation is different.