If you have even a moderate ability with your hands, then DIY all the way.
I am completely useless (or at least, completely without confidence) in anything other than trimming (where I'll admit I have experience and some degree of talent), but I think I made a half decent hash of my van myself in all respects.
But I have seen (sadly) many 'professional' conversions where the trimming work is, quite frankly, complete **** and isn't even in the same league as what I could do myself - yet they're charging 4 figure sums for work that I could **** all over in a day and have done either for free or for a set of steel wheels!!!
I'm not saying this is always the case, and not saying anyone on here is doing such a thing, but I can assure you that I HAVE seen widely publicised VW 'conversion companies' who's work simply doesn't come close to what I can achieve on my drive with limited tools and next to no resources.
So - don't be fooled by fancy prices and fancy brochures...........quite often, the bloke in the shed who's doing this type of work as a foriegner is often the best bet for a quality job.....
We ALL have some form of skill, maybe more than we care to realise, that can be utilised with a little help or guidance.
In the meantime, if you have money to burn and want your metalwork/panels trimmed, then you could always get in touch if you're desperate........ I'll happily take a few hundred notes for carpetting your van Rasp: I: