What's hard is looking at the build as a whole and not as a set of discrete tasks. For example; you can let the interior design drive the placement of the windows and doors or you can let the window and door placement drive the interior design.
There are a few ways to go about it.
For myself it is pretty simple, once broken down.
Most seem to start with a shell that they like visually, then make things work within that shell.
Unfortunately doing it this way all you are doing then is "settling" on a layout at the mercy of the shell.
You are not allowing the finish product to actually meet your needs. (form over function)
To solve this, I basically reverse engineer it, starting from the inside and working out. (function over form)
To me, this is the ONLY way to truly take advantage of the custom nature of a custom camper.
Otherwise, don't waste your time and money, just go buy a cookie cutter unit off of a lot and be happy (enough).
Most people do just that, and that's fine. But if you want a truly custom camper, you have to invest the time and money to do it right.
As I see it:
Lay out your goals, treat them as
problems and creatively find
solutions to meet as many of those goals in a camper that works.
Everybody has slightly different goals, so there is no one-size-fits-all solution.
Though at the end of the day you still require a camper that functions properly.
Once pushing an idea to paper or CAD, I always start with the floor plan.
The floor plan must be livable. Period. And your style of
Camping/RV'ing/Expedition Travel should dictate how the interior flows.
Once one or two rough floor plans are generated, placement of fixtures within the cabin are sorted.
Normally, the placement of these fixtures like appliances and cabinets will show you which floor plan works best,
as well as what overall shape the camper may take. Its a balance of needs, flow, and function.
You have needs, the floor plan must flow, and the camper must function.
Once a floor plan and fixture layout is finished, I push to structural.
Having the floor plan and locations of fixtures allows you to build the structure around those parameters.
During this stage you find where the wall and roof penetrations will be, how utilities will be run,
and it will uncover many options and potential problems that may send you back to the layout stage.
These are problems that you WANT to crop up. Otherwise, they will show themselves in the actual build, potentially creating serious issues.
Spending 2x more time in CAD than you thought required will save you time and money in the build stage.
All this is just the design phase.
Once a satisfactory design is found, you use the CAD design to calc materials lists.
Only then will you know what you are looking at for cost for materials.
And if you do more homework, you will also know what the camper will weigh finished.
Any questions, please feel free to hit me up.
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