Don't get hung up on the length...the number. It is a big little boat. I lived on mine for 5 years....almost 3 of those years with my then girlfriend. There is a lot to like about this boat. It has a huge amount of drawer space...and could likely be customized if you needed more. It has a huge hanging locker. The head is big enough.
My boat was Hull #55....the last one made. It had the open galley/salon area...not the U shape galley. So the open made it feel more spacious...I think. But I was always envious of the u shaped galley as it seemed more "shippy".
Anyways, if you don't feel the need for that 36, the 29 should do fine. My biggest complaint about the 36 is 2 engines. THat boat would be awesome with just one 6-354NA. I have no idea why they put 2. And if they thought they needed power, then put a 200hp turbo version. But man, what a waste...in my opinion. A waste of space and maintenance costs.
I am writing this without looking at you links above. I will look after posting and edit if I feel the need to say more. The P29 is one of the best boats I have ever had. If you can get it with the 4-236, that is optimum. It is a solid 6.7 knot boat at about 1GPH...maybe a tad more but not much. For a small coastal cruising powerboat on a budget, I do not think it can be beat. I shopped the Californian 34 and Mainship 34 against it. The Prairie won...although I think all 3 boats would serve very very well in the same capacity. The Prairie choice was my wife's emotional choice. I do believe the Prairie was much better built than the Mainship. Just overall glass work and wiring work. It was..."tighter" all the way around. I can't say much about the Californian because I did not get to spend as much time on it.
Edit after looking at links: The link to that first boat is broken. That second boat looks pretty damn nice. It looks like someone has put a lot of work into it. One of my cautions is that generator. If it is OEM, most generators of that era that were 7.5kw are the Onan 2 cylinder screamers. It may not be...but if it is, they work fine I guess but they are LOUD as hell. That is a very small boat so it is hard to get away from the noise. Otherwise, it looks pretty dang nice. I like that they have put in tempered glass and aluminum frames. At some point in their history, OEM went from plastic windows and plastic frames to glass windows and aluminum frames. It just looks better...WAY better. That transition also took place with the cockpit overhang covering the cockpit. Again, it just looks good....shippy. Also that transition put glass around the flybridge "windows" versus plastic...again, just looks better. Let me look for a pic of my Prairie to give you an idea...