Akatonbo Summer Rin (aka ISAO Summer Rin) is available to download through ISAO's diary entry.
Editing and body swapping is allowed for personal use, distributing the edit and texture is prohibited.
Ver.1.0 ~ (2010/Dec/27)
PMX ~ (2012/Mar/10)
炉心リン非公式夏(全親).pmx (motherbone included)
This model was used for the "Ur-Style -arbitrary style-" PV.
This is likely the only full base model edit that was given permission by ISAO to be distributed.
Note that entry stating "Japanese only" is informing Japanese readers of how to properly inform foreign readers that the site will contain much Japanese text. Because "Japanese only" appears rude and is often misinterpreted.
On March 10, 2012, ISAO converted the model to PMX format and has fixed up the textures, even adding MikuMikuEffect to the model.