Knowing the parts-sets that I sold you a few years ago......then looking at "today's" market (not 5-6 years ago, nor what the future could bring) my thoughts are:
1: You may be able to sell the Dealer-Sample at about $5k-$6k.......but it's a very limited market, and will probably sit on the market for a year (or more.).
Basing this on sales of C&R Transferable MG34s (I had to take a price-hit on the sale of my C&R MG34 a few years ago, and TNW semi-only sales where the market may be stationary at this point due to lack of "Hobby-Funds" availability.
2: The semi-only model will probably have a same effect on the market.......you can only pull the trigger so fast, and then guys look at a registered FA MG34.
Add about $1,000 to the price of a semi-only TNW SA34 for it being an MG34S or MG34/41 (but semi-only........and this many/may not cover the costs of making the semi-only receiver.....(?). The other "down-side" is that some of the parts such as the bolt will have to be "cut" to make into a semi-only bolt....this brings down their collector-value.
3: Your MG34/41 Lafette will play into the sale(s) somewhere along the line........there were far fewer of them made than standard MG34 Lafettes. The problem here is that I looked into the possibility of using (or making the trigger-parts) an MG42 trigger-assembly from a Yugo-Lafette.....very similar as far as looks and could be modified.
Challanges (Problems) that you will face are available funds on your end to make the required parts/assemblies........challanges on the other end will be available funds for the buyers.
Another "option" is to sell-back the Parts-Sets, Spare-Parts, newly made parts, Lafette, to me (adding in a slight "premium" for doing some of the work/searching that I didn't get a chance to do)...(?)
My contact for your offer is :Blanksguy2001@chartermi.net
Regards, RichardS in MI.
US Army, RetiredBlanksguy2001@chartermi.net