I've had the Italeri M109 No 235 in my horde for at least 15 years, and I think I got a set of AFV Club for it in the past decade.
I'm a keen Vietnam era modellor and I've always intended to build it as an American Army vehicle in plain olive drab (weathering for dry or wet season makes for interest in otherwise drab vehicles).
I'd dug out the kit more than a few times over the years and all of the parts remained on their sprues. From my research, the old kit is quite sound, albeit with some hatches annoyingly moulded shut and some tools that definitely need replacing.
Looking back, I think why I'd always baulked were the sink holes in the side of the hull and around the base of the turret. I've been modelling for 40 years now, but I'm always learning, and when I took another look on Friday, them sink holes didn't seem daunting at all, and by the time I went to bed I had the basic "block" built, sans sink holes thanks to Tamiya white putty:


Last thing I applied some Gunze Mr Surfacer and this morning I smoothed out the turret and side panels, as well as enlarging the commander's hole to accept a Tamiya M113 ACAV cupola (these were fitted to American Army 109s in Vietnam, although I can't say how many ... I had the cupola with shields all ready built as part of a long abandoned project):

Tinkering on and off throughout the day, I got most of the little bits in place, and tomorrow I hunt down some tools and see if I can give the beast a squirt of OD out of a can, and maybe even apply some decals:


Compared to my other epic odysseys, this one is definitely a "no brainer", and the painting will be be a breeze.
The fit of the kit is excellent, although the moulding and some details are starting to show their age. Nevertheless, a fun build which results in a distincitive looking track. Keeping with the ethos of keeping it simple, I'm going to depict the 109 in travelling mode with the gun in the lock, which means the base will not need to include an emplacement.
Anyway, if work doesn't impose itself on me tomorrow, I might post of pic on the kits on OD with some stars.
Any pointers about features for US Army vehicles in Vietnam welcomed ... I've basically built the base kit without the Euro features such as smoke dischargers and turret jerries.