About challenges, I have enough in my life I really don't want them with my hobby. There is enough of a challenge getting up and feeling well enough to do the model. I'm not expecting perfect models but if I spend $25 for a kit I expect a little accuracy. If I have to rebuild the whole model then to me it's not worth it. Unless like the 155mm towed it is the only game in town until now that is.
There are models that companies just do not make so if you want one then it's scratch time. So that is another story. One is the MSSC seal boat, a great little boat that nobody makes and I will attempt to scratch eventually. But that's a very square shape with very few features, just a very high coolness rating when added to the PBR and LSSC.
The other is the M37.
But while working on those M113 and variants the amount of just plain inaccurate details was driving me crazy. Just when I thought it was going good I saw 3 more details that were wrong or not there, then another 3 or 4, then another one. It was never ending until the model was taken down and rebuilt too many times and looked like crap. Now I know better and if doing one I can fix it. But you can't start it and keep on fixing it because you see more and more things. That's how I came up with the marriage of the Academy kit, they are different sizes, the acad kit is a bit wider but the same length. It's doable. Now that I have all the details it is much easier. Like anything else knowledge is the key and my lack of knowledge sunk me. Now I know the many deficiencies of the kits and can correct them from the start which is much easier.
I think certain kits are just dogs, the question of it being worth it to even do is up to the individual. I had a choice of buying the 1/32 scale M55 8" SPH reissue for $30 and doing a lot of work to it or the German made 1/35 which is on sale. I opted for the hopefully more accurate and expensive German made one. Simply because it was 1/35 scale and I want to keep to one scale.
I was amazed at one builders work with an old Renwal M55, it was amazing, of course he was a master builder and scratch built most of the kit replacing so much and building a whole interior. A work of art, his name eludes me but you can google it. A truly amazing build. I also found the builder who made the molds for the German M55 for them and the whole M55 was scratch built, it took him 2 years. I am a bit disappointed that the German kit for that money has no interior. But I am not really an interior guy.
Interior work amazes me because of the small details involved and I give people credit that do them. I'm just not into building things nobody will see since I prefer action scenes and figures. I have noticed many great builders avoid figures. Like all builders everybody has their own thing that they concentrate on, some avoid interiors and some avoid figures, some avoid being too accurate and just make the model from the kit without hardly any aftermarket stuff and they look great.
I think it would be great to have that $150 M55 being pulled by the $200 M51 in a dio. Both kits need zero add-ons and supposedly come with everything you need. I like that, they are hard builds as it is. I can see a cool dio with a bunch of figures hooking them up to tow the M55. I'm sure that happened plenty in Vietnam.
Also some people don't have the room in their living quarters to have so many projects unfinished. Were I live interior square footage is at a premium, you would be shocked at the prices of everything especially rent or the price of a home. I cannot make an assembly line so for me to have to do that much work has to be weighed carefully. Everybody has their limitations and beliefs so I really don't question them, everybody is different in that respect and I respect those differences, unless they are full of crap which is a different story.