@bxcc, your twin top tube design reminded me of actually wanting Waltly (thru Carbon Speed) to make a Ti version of the Commencal Acid (see photo). But Waltly's reply was they couldn't do it at that time, they would have to build a new mold (or something) and it would be very expensive. I wonder if it's doable now.

Did you ask them to make it especially light ?

You can specify the tube diameter size and tube thickness. Their default tube thickness is 0.9mm. They will comply but that is at your own risk. I did specify tube diameter on my first one but I let them have their way on the second one. I didn't bother with tube thickness on both though.

The first frame was 1.935kg including the brake/TA brackets. So I'm expecting the 29er to be a tad over 2kg.

I'm currently on my second Waltly Ti bike. My first is this gravel bike.

Got the second one into production just before the COVID lockdown on March. It was done and shipped to me early-May but the lockdown had delayed the delivery on the local end. I am expecting it to arrive any day this week though. What is it? Well, it is a 29er hard tail. Geometry was based on the Niner S.I.R. 9. With a modified dropout. I loved what I did with the first gravel bike using a horizontal sliding dropout, so the second one also had that. With the 29er coming, I plan to setup the gravel bike as a single speeder... I kind'a learned to love the simplicity of an SS during the lockdown. Pretty much rode the Haro Projekt 2016 fixed/free bike around the subdivision daily during the lockdown. Sold the Projekt as soon as we improved from ECQ to GCQ. This new 29er will be my geared bike. The only difference my 29er Ti frame from the Niner S.I.R. is internal cabling, sliding dropout and boost hub spacing.

Below are photos of the 29er.

@Carbonanza, it's more. The representative I'm dealing with was pretty good with her English. Not as good as Peter but still good. But she's obviously not a technical person. I requested for threaded BSA bb for Shimano mtb crankset and she doesn't know what standard it was. I had to be very detailed with what I wanted and also found myself repeating some details that were already previously mentioned. I initially wanted a plus bike but it us 2 design prints & a dozen emails before they told me they couldn't build it. So I opted for a regular 29er. In fairness, she is handling several clients and had been very polite. Also in the later part, she did showed initiative to actually check the actual bike that I've patterned my geometry on and was able to point out some discrepancy with my data. And request confirmation & corrections. Peter would have just auto-correct it, then inform me of the correction and save us time. Although, I understood why Waltly had to be very specific. Besides, based on my research, it seems normal that it takes a lot of emails and time with Waltly. But the results are often very satisfactory, so I'm not really worried.

Isn't Planet X a British bike company? The one making On-One bikes?

@Ray Lee, which size fork did you get? And how was it (construction, bolts spacing, weight, other observation)?

Sad to know Peter is leaving this industry. Best of luck in his new endeavors though.

A little update...
Replaced the 1x to a Tiagra 2x chainring set. Loving the increased speed and easier climbs.